Hello
Thank you for your question and reaching out. I can understand you are having query related to adding SSL certificate in to Windows 11.
You can use MMC to Install certificate to Windows 11 after you have download from CA Authority.
- Start by typing in mmc.exe in Run to launch Microsoft Management Console.
2,. From the top menu, click File and then click Add/remove snap-in. - From the pop-up window, select Certificates under “Available Snap-ins” and then click Add.
- In the next window, select Computer account and click Next.
- Move the new certificate from the Certificates-Current User > Trusted Root Certification Authorities into Certificates (Local Computer) > Trusted Root Certification Authorities.
--------------------------------------------------------------------------------------------------------------------------------------
--If the reply is helpful, please Upvote and Accept as answer--