Re: X-Cart v4.1.10 released
Yes. Only your database will upgrade from 4.0 to 4.1, your files/skin will not.
It's probably best to upgrade before going further with customizations. Plus, 4.1 has a number of features & speed increases over 4.0, makes it worthwhile, in addition to mods that are more often being developed for 4.1 than 4.0
: Unethical developer - NOT RECOMMENDED
See details here