I upgraded a site from 4.2.4 to 4.3.1. I did not adjust anything after this but went directly to the next upgrade (4.3.1 -> 4.3.2). This is the file modifications it shows for that upgrade. Note that none of these has every been modified locally.
Local modifications
<p style="margin:0px 0px 10px;font-weight:normal;">These files have local modifications and will be backed up; resolve the conflicts after the upgrade is complete.</p>
<div style="color:rgb(51,51,51);font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;font-style:normal;font-weight:normal;background-color:rgb(255,255,255);">
Files
Action
app/lib/vendor/autoload.php
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
app/lib/vendor/composer/autoload_real.php
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
app/Tygh/Shippings/Services/Ups.php
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/access_restrictions.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/age_verification.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/anti_fraud.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/attachments.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/banners.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/barcode.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/bestsellers.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/buy_together.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/call_requests.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/catalog_mode.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/customers_also_bought.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/data_feeds.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/discussion.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/ebay.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/email_marketing.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/form_builder.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/gift_certificates.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/google_analytics.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/google_export.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/google_sitemap.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/help_tutorial.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/hidpi.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/hybrid_auth.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/image_zoom.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/janrain.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/my_changes.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/myob.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/paypal.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/polls.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/price_list.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/quickbooks.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/required_products.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/reward_points.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/rma.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/rss_feed.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/sample_addon_3_0.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/searchanise.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/seo.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/sms_notifications.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/social_buttons.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/store_import.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/store_locator.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/suppliers.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/tags.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/vendor_data_premoderation.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/watermarks.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/addons/wishlist.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/core.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/langs/es/editions/mve.po
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(248,148,6);">Will be changed</span>
var/snapshots/4.3.1_ultimate_dist.php
<span style="font-size:10.998px;font-weight:bold;color:rgb(255,255,255);background-color:rgb(185,74,72);">Will be deleted</span>
</div>
I understand that my local modifications will be permanently lost during the upgrade