i found this on this forum
UPDATE :
New .reg file to add missing registry keys, the older had a missing "/" on some path. Link below
EDIT : Solved ! (Normaly)
Thanks to Tualens, we've found a solution (not sure if its work for everyone)
Certain version of windows force the use of a wrong TLS (a service that work in pair with .NET).
Solution is to add new key in your regedit that force your windows to use another version of TLS.
Two method possible to do that :
1. Hard way, opening regedit and adding each new key manualy
adding the following registry keys:
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v2.0.50727]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v2.0.50727]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001
2. Easy way, thanks to Nellkee and Tualens, we have a .reg file that automaticaly add these keys to your regedit.
https://we.tl/t-eMeSRtiPDQ <- Here is the link to the .reg file.
Download it, launch it, it will ad needed key, then launch the RoRLauncher and it will be fine, normaly.
But now i don't really know how to put this key, link doesn't work, if someone know i take solution, if not i'll search