Try following the instructions on the page at https://www.cnet.com/how-to/always-run-a-program-in-administrator-mode-in-window...
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1. You probably use a more recent version of Windows. You should reinstall the game but instead of using the default install path you should install the game to a folder on your desktop or inside your user folder. In fact because of how all the pre-Robot Wants It All Hamumu games work you should just make a folder on your desktop or inside your user folder to install Hamumu games to.
Did you install the game into a folder that your Windows profile won't let you alter? Do you remember to manually save using "Save Game" on the pause menu? Do you go to the world select screen by using "Select World" on the pause menu or do you get there by using "New Game" on the title screen?
This MediaFire folder has all the add-ons in 3 zip files Dr Lunatic Add-Ons. Each zip file contains installers for add-ons. There is probably a limit of 64 custom worlds. I don't know if this includes the 5 main worlds. The contents of all three zip files are compatible with this version of Dr. Lunatic. The reason for the different zip files is that before the most recent update to the game there were 2 expansion packs for it. There was first the Expando-Pak then there was the Fun Pack. Because this version of Dr. Lunatic comes with both packs the separation of these world installers into 3 zip files is purely for historical purposes.