labscript_utils 3.0.0 removed the check_version function. This was because it was no longer used by the labscript suite, which now manages its dependencies using pip/conda. However, code that is distributed in forms other than packages on PyPI/anaconda cloud, particularly code living in userlib, cannot use pip/conda to manage versions of its dependencies, so it is still useful to provide a function to do runtime checks.

So we should add it back in

See brief discussion here