purchase IntelliCad v14.1 PE license

#1
Hello,
I've been testing IntelliCAD V14.1PE for a week now.

I enjoyed using it (in French) and would like to purchase a perpetual license via download.
Can I install the license directly, or will I need to uninstall and then reinstall the downloaded IntelliCAD V14.1PE?
I customized the interface and adjusted some drawing settings, and I'm worried about losing them. Is that possible?

Thank you.