Why Install Critical Patch Set is not Enabled in PSI. How can we Enable it?
CPS installable come with their own packages and it has a specific set of procedure that need to be followed.
try accessing below PTC TS Article which would help you: https://www.ptc.com/en/support/article/CS149102
also check the video: https://www.youtube.com/watch?v=9mWjojL8WVU
let me know if you have a question.