After you did the Uninstall for the PrPro CS6 trial, did you run the Adobe Cleaner Tool: http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html ?
If not, I would definitely use a Registry cleaner, such as the free CCleaner, to clear out Registry references to any CS6 products. Actually, even if you did use the Adobe Cleaner Tool, a Registry cleaning would be a good idea.
I have seen that type of message even when other versions were involved in that same type of situation.
I would have used the Adobe Cleaner Tool immediately after the Premiere Pro CS6 trial uninstall and before the Photoshop Elements 12 Premiere Elements 12 installs. Did you do that?
The ccleaner tool is excellent for getting rid of leftovers from incomplete uninstalls or installs. ccleaner comes in a Windows and Mac version.
Hopefully the above remedies will resolve the issue and avoid any manual removal of registry entries (can be dangerous if unfamiliar with registry editing).
The question is will Photoshop Elements 12.1, Premiere Elements 12.1, Elements Organizer 12.1, and QuickTime (latest version) continue to run after the cleanup and removal of CS6 leftovers? Worst case, uninstall/reinstall of the Elements versions and QuickTime. Hope not.
We will be watching for your progress.
Grazie a tutti.
Ho dovuto disinstallare Photoshop e Premiere Elements 12.1.
Pulire il registro con CCleaner (Adobe Cleaner Tool non é statu sufficiente).
Ho riavviato e reinstallato Photoshop e Premiere Elements 12.1 .
Ora tutto funziona correttamente.
Grazie a tutti per la collaborazione.
We are very pleased with your good news "...everything works fine." Great job.
Thanks for the follow up. Much appreciated.