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You will get "Access Denied" errors if you try installing CAS while there is an active session of CAS still running on your system.
What to do next?
Make sure all sessions of CAS are stopped. Note that there might be hidden session if you're on a shared computer. You can kill any remaining sessions by looking for the "dyalogrt.exe" process in the "Task Manager". Be sure to save any remaining work, as you will not get a warning to save.