I notice you're asking about installing a "Team R2R root certificate" from 2021. Team R2R is a group known for cracking commercial software (producing keygens, patches, and loaders). Their root certificates are typically used to make cracked software appear digitally signed to bypass Windows or macOS security checks.
Troubleshooting
Choose (this requires administrator privileges). Select Place all certificates in the following store . install team r2r root certificate 2021