Please contact us via Customer Help Desk and provide temporary access to your server by clicking on the Add record link on the Access information page of your Help Desk account so that we could examine the issue.
1. Click the Install button and wait for the decompress error to occur.
2. Copy the var/upgrade/uc.tgz file to the var/upgrade/upgrade_4.2.2_ultimate-4.2.3_ultimate.tgz directory and extract it via cPanel.
3. Open the app/controllers/backend/upgrade_center.php file and replace this line:
if (fn_uc_get_package($_REQUEST['package_id'], $_REQUEST['md5'], $package, $uc_settings, $backend_files) == true) {
with this one:
if (1) {
4. Run the upgrade again.
5. Repeat the same steps for each upgrade. The directory on the second step should be changed according to the current version (a new directory will be created automatically after the first step).
Note that this error will not occur starting from version 4.2.4 because upgrade packages have different structure.
Please note, that after you get from 4.2.2 to 4.2.3 you need to revert charge, otherwise cart will not download new uc.tgz update file.