As have been with 2.1.4 for quite some while (only because the functionality was more than adequate for this period) I am now looking at upgrading to the lates version 4.3.5.
Previously was able to find infor on the "stepped" upgrade process but cannot seem to find that information easily, even in the KB.
Help is always very much appreciated.
Use this instruction: http://kb.cs-cart.com/how-to-upgrade to upgrade to version 2.2.5
And this: http://kb.cs-cart.com/How-to-upgrade-with-store-import to import your store into version 4.3.2
Then you should upgrade it again via Upgrade Center to version 4.3.5
Just few notes. The Store Import module was removed since 4.3.3 version. So you need to download 4.3.2 version from the following thread:
cmebd, if you want professionals to perform the upgrade for you, feel free to contact us