Yep, downloaded the TheoryLive_Pack.zip_ and did some testing here ( though I haven' t try to install the .alp pack file, but I can confirm that once unzipping the archive, the main SA Scale Template.als file won't load up in Live 10 when the SA Scale Template.als file located in the SA Scale Template sub-folder will load correctly. See the pic for more clarity
So the question here is more : is there a difference between the SA Scale Template located at the archive root and the one located in the ...Project folder ? @chris_agnelli might be one to check by your end if still possible ( it's a 2016 course ) , can't really tell much more on my end in order to help the user here
Edit : Tested on MacOS High SIerra latest and ABleton Live 10.0.06 + latest Beta BTW.