I'm having some trouble getting my licenses in order.

.otl files created in my Apprentice version of Houdini cannot be accessed in my Unity Projects:
This is the ERROR message I get.

Also, I've tried upgrading to the Free Indie version of Houdini and have all the requisite licenses, but even when I open the ‘Houdini Indie 15.5.565’ application it STILL opens as the apprentice version?

Somebody please help?

Houdini will revert back to the apprentice license when you open a .hipc file.

You used to be able to cut and paste nodes from apprentice to FX, but that doesn't work anymore. If you want to get your nodes into indie you'll have to re-build the scene in indie. Or you can bake out the end result from apprentice to a .bgeo sequence, and then bring this into indie with a file node, and carry on working from there.