Update: Nevermind. I just found the sleep list (with Package Installer already there) and the special instructions for Android 5.
I signed up for the BitBucket acct to see if this was in the bag tracker, but got "Access denied."
When Lux is running, I cannot install apps from Package Installer. The "Install" button is blocked. The "Cancel" button works. I recall having this issue years ago with my Samsung Tab 2 and an Automatic Brightness app. Lux version 1.0-2015-09-08I running on a Zenpad S 8, Android 5.0.
It would be nice if the Lux interface had a Disable button to test for touch blocks. Would save having to drill down thru Config > Advanced > Disable Service.