How to install packages offline

I installed 2021 and I am trying to bring up the website and I get this error:  "The feed package is not installed".  Ok, so I think I can just install it.  But none of our servers have internet access.  So I see that a local repository is possible.  I can't use the "cfpm downloadrepo" because there is no internet access to download all the packages.  When I try downloadrepo I get these error message for the download for each package: "Illegal character in opaque part at index 2".  There does not seem to be a website to download the repo.  So what do I do?  Any help appreciated.