It is possible to get this error when linking to a Git repository which contains large files and is set up with git lfs.  This is due to a bug in git lfs. 

If the files that fail to get downloaded are not needed for working with your SQL Source Control project, you can work around this problem by instructing Git not to download binary files. You can do this by running the following command in a git console:

git lfs install --skip-smudge