When i try to install dotnet45 from the configuration tab, it tries to download dotnetfx3.exe from uni-smr.ac.ru (it seems to be impossible to copy error messages from pol)
This download fails
Just noticed: Has already been reported on 3.12.16, Bug #5413
Quick and dirty solution:
http://www-pc.uni-regensburg.de/systemsw/tools/net/3.0/en/dotnetfx3.exe
optional: compare md5sum with ~/.PlayOnLinux/tmp/ POL_Install_dotnet30
(7b26435437e8d779ff0084d4ea96d15a)
copy to ~/.PlayOnLinux/ressources/dotnet30/
Ah, very nice! I will give it a try.