so i checked this site http://files.teamspeak-services.com/releases/client/ and i get error 404 Not Found when i want to download 3.5.0 and 3.5.1 installer .
Yes that’s intended.
Why? 3.5.2. is having issues for lot of us, so why can’t we download 3.5.1. from the official source?
This is deliberate
Did you check the content there before posting? e.g. where is the 3.5.1 CLIENT there?
Could it be that 3.5.0 and 3.5.1 have a serious security bug and that’s why there are not available for download anymore?
No that is not the case (at least we are not aware of any such issue and it would be the same case in version 3.5.2).
Thank you, good to know.