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I'd say some more training would handle your issues.

I've had ZERO problems upgrading with the new license.

That, I can't answer.
Again, the license would just prevent a station from running. You should still be able to connect and see in the App Director, and it would say that the JACE is not license to...

It depends on what went wrong. But if it was simply upgraded, it should downgrade just fine.

BUT FOLLOW THE DOWNGRADE/CLEAN DIST INSTALL DIRECTIONS!
DO NOT DEVIATE FROM THE INSTRUCTIONS!
Or...

What you did, the process (loosely), is what I would do when upgrading. But you need to make sure you have the license before upgrading.

I suppose they could have three or four pop-ups asking you...

If you upgrade, as ChrisW advocates, one of the selections is install license.

I guess they figure that if you're upgrading, you know that the new license must be installed as part of the process.

I would think you should still be able to get a platform connection if it is 'just' a license problem. The license will just prevent you from running a station. I'd do the port dump and see what is...