I've certainly answered any questions concerning such an error in the last two weeks. I can only imagine that the replies have run into a spam filter somewhere.

You can try to run the attached registry file to add your serial number in the proper locations. Open it in a text editor and enter your serial number in the two locations marked as XXXX-XXXX-XXXX-XXXX.

Save the file, then double-click it to add it to your registry. Run CC3+ again and see whether the message is gone.

Edit: Added the file zipped to be allowed on the forum.

Have you scrolled down in the Structures catalog? Thew new symbols might not be at the start of the list anymore.

I just noticed this folder is only in the Update, not it in the full install (will be fixing this). For now, just run Update 26 and it should install the UserManual folder.

Hi Nikode! That looks as if your selection method by be set to "Select by Layer" perhaps by an aborted macro. Please go to Tools > Options in the menu and under "Select Method" set it to "Select by Dialog or Popup". Does it work properly again, afterwards?

Just send in a support request, listing your new CC3+ serial number you got from Humble Bundle. Ideally, don't put it on your account, but if you have done already, that's no real problem either.