Ok, that is a bug. Unintentionally added a option in RepetierServer.xml that forced a license.
Please install 1.4.6 manually when it gets released today or just edit the file using:
sudo nano /usr/local/Repetier-Server/etc/RepetierServer.xml
and delete these 3 lines:
<branding>
<shadow-www-directory>/var/lib/Repetier-Server/www</shadow-www-directory>
</branding>
Then restart server with
sudo service RepetierServer
That is actually what the update will do as well so both solutions are identical.