So I recently bought Minecraft again to solve an issue with Minecraft that I had. I downloaded Optifine so I could run shaders if I were to stat playing  on that version. However, now I can only play on that Optifine version (I have the 1.14.4 version of Optifine). The snapshot and latest releases won't load; they just give me this window:

Failed to download file.
Name: 1.15.json
URL:

https://launchermeta.mojang.com/v1/packages/62745391056f1d0e1ffc808a0d4f0145b668ca24/1.15.json

Error details: schannel: next InitializeSecurityContext failed: SEC_E_UNTRUSTED_ROOT (0x80090325) - The certificate chain was issued by an authority that is not trusted.
Filename on disk: 1.15.json
Path: C:\Users______\AppData\Roaming\.minecraft\assets\indexes\1.15.json
Exists: File