With the new update i got virus-warnings and it refusses to update of re-install even with my anti-virus software deactived. you know any solution?

I managed to update it by using the downloadable update, but as soon as you start galaxy it does as you say. Constantly tries to update along with anti-virus quarantines of the CEFProcess. I've uninstalled and going to try a fresh installation.

When i try this i got the message "Disk Full." and it still try to install.

I deleted the !Temp folder in the stellaris directory, that solved the disk full message but still gave updete errors. I've got the game running the lastest version by doing a complete reinstallation of the game. My anti-virus is the next issue I have to solve.

yes sounds like the real issue is your antivirus software... updated fine for me