Thread:Project:Support desk/Non-developer's Guide to Git/reply (3)

Both of those extensions are being developed by a different group then the people who are developing MediaWiki core (To be accurate, Maps is developed by someone who is also active in MW core, but he has for some reason chosen not to host that extension on wikimedia repos), and the people developing those extensions decided not to use Wikimedia's source control repositories.

You should still be able to download archive files for those extensions, the format however is zip instead of tar.gz (Most unix hosts have an unzip command, so you should still be able to upload then unzip in a similar way to a gz tarball). The link to download the zip archive on github, is on the sidebar on the right hand side, towards the bottom (It has the text "Download ZIP").