@tomrod If I understand correctly, you are able to import the library and you are able to switch the library between versions using the ‘Check out to version’ action. It is when you attempt to update all libraries to latest that it hangs. I have tried this out and I have not been able to reproduce the problem. However I note that this library is using ‘6.x’ as the name of the master branch, there being no ‘master’, or ‘main’, or ‘development’ branch. This will disable ‘update to latest’ for this library, but it still should not cause the hang you are seeing.
Also there is work in progress to change Mbed Studio so that it does not assume there is a master branch. This library will be a good test case as it does not have ‘main’ or ‘development’ either.
You should be able to work-around the problem by avoiding ‘update all libraries’, or just cancelling out when it hangs. Another work around would be to rename 6.x to master in your fork.