Ah, ok i didn't know that

If you read for just one second you can see that you have to agree to the CnCNet terms & conditions in the settings The game's changelog can be found here: https://github.com/CnCNet/cncnet-yr-client-package/releases

I will try to do that

I made a small mod that adds both the RA2 and YR music to YR. You can download it here: https://www.mediafire.com/file/q8heeiqjqtjc8x2/ra2musicinyrmod.7z/file If anyone wants another mod like YR music in RA2 or only RA2 music in YR let me know!

The CnCNet directory is the Red Alert 2 directory where you installed CnCNet

Do you have good internet?

What happens when you disable windowed mode? And if you set detail level to high?