Many thanks for this good solution. This will work.

I’m wondering if more paramter for installing np++ exits.

But with your solution it works fine :-)

I don’t know the switches but what about using a little batch script
which would do the installation and checks afterwards if the directory
exists and deletes it?

Something like

if EXIST %appdata%\Notepad++\theme rmdir %appdata%\Notepad++\theme

Cheers
Claudia