It looks like the domain raw.githubusercontent.com was blocked in China a few days ago. https://ntc.party/t/raw-githubusercontent-com-blocked-in-china-since-2019-10...
This affects GetTor, because it uses links like https://github.com/TheTorProject/gettorbrowser/raw/torbrowser-releases/torbr... which redirect to https://raw.githubusercontent.com/TheTorProject/gettorbrowser/torbrowser-rel...