Premiere Elements 11 should work on Windows 8.1 64 bit very well.
I have used Premiere Elements 7, 8.0/8.0.1, 9, 10, 11, and 12 on Windows 8.1 64 bit, and they all work well.
Please let us know if you have more questions on this or need clarification.
Hi Plein Sud ,
Welcome to Adobe Forums.
Yes you can run Photoshop/Premiere Elements 11 on Windows 8.1.
Please check the below mentioned links for supported OS details:
Please reply for any assistance.
Since you posted your question in the Premiere Elements Forum, I assumed that your "Elements 11" was Premiere Elements 11 and answered accordingly. My answer would also apply to Photoshop Elements 11 and earlier versions of Photoshop Elements.
But we aware that Premiere Elements 11 will be a 64 bit application when run on Windows 8.1 64 bit; whereas Photoshop Elements 11 will be a 32 bit application running in the 32 bit compatibility mode of the 64 bit system.
Nonetheless, you should expect good performance for either Premiere Elements 11 or Photoshop Elements 11 on Windows 8.1 64 bit. And, the above would be applicable to Photoshop Elements 12 and Premiere Elements 12.