I also installed it in 3.6.2 but have no problems (yet)..Also no message like: "Out-of-Date Custom Templates Found!" (yet) :P
ETA:
I just changed forum permissions and starting from there the template gets messed up. As long as you don't have any forum permissions where only certain groups can see it then it shows as it should be.
I'm sure Andrew will update it for 3.6.2
ETA2: Never mind.. I forgot to set the forum accessable for certain groups as a category. It shows oke now