No, You won't lose your custom theme of layouts, however you can loose your modified files.
But I still would recommend to make sure you created a backup during upgrade.
Hi,
I have been working on fresh copy of cscart 4.3.9 and applying custom layout and other changes.
When the cscart announced the upgrade to 4.4.1, i was asked to upgrade the system to the latest version.
I tried to upgrade it to 4.3.10 first via Upgrade Center and got following error at the end of the installation of upgrade :
There was a problem creating the schema table: Invalid default value for 'end_time'
then i reloaded the web page to see the reflect and found the cscart 4.4.1 upgrade available to install. then i downloaded that upgrade and install it but unfortunately i got the same error again and cscart didn't upgrade to 4.4.1.
Any help would be appreciated,
Thanks and Regards
Naeem Choudhary