Unable to install scripts / admin rights

I’m having a problem that no one seemed to report on the forum.
When I try to install the scripts through the server, this is what I get for answer:
-Fail! Please restart server-
-Please do not start touchable with admin permissions to install scripts-

I’ve tried everything, including creating a regular account. In that case the server won’t even load…
If anyone can help it would be great.
Regarding all the messages on the forum, the installation looks insanely unreliable, it is not okay to pay 25 box for a software that won’t work.