Garrys Mod Problem? (I think it is anyways)

When Garry’s Mod went over to Steampipe, I heard my garrysmod/garrysmod would change to garrysmod/garrysmod_old,
well mine didn’t. Its still garrysmod/garrysmod.

I’ve tried validating all the files and re-installing, but it still hasn’t changed. Will this be a problem for me or can i continue to play this way?

Follow this tutorial:

It’s at the end of the OP.