Recently upgraded two computers to Windows 10, one from Windows 7 Professional SP1 64 bit, the other from Windows 8.1 64 bit. Premiere Elements 12 on both of them worked before and after the upgrade to Windows 10.
My general impression is that Premiere Elements should work the same (same problems and successes) before and after the upgrade.
Please review and consider. Any questions or need clarification, please do not hesitate to ask.