Where can you safely install Minecraft shades?

Can also write shader recommendations

RTX Shader 1.15

(You can just google)

I'm afraid of getting a virus

Yes, do everything step by step and do not click on any download ads

If you want to make sure you are using a trustworthy and genuine looking website. If that is not enough for you, then let an anti-virus program scan the shader first.

PS: With Windows Security this is very easy if you have a Windows 10 PC. Just go to scan options and the rest should be self-explanatory.