If I download a trial of Photoshop CC or when I do purchase, will my Photoshop Elements still work?
I'm pretty sure it will.
For further reassurance, you can visit the Photoshop Elements forum:
Community: Photoshop Elements | Adobe Community
PS Extended and PS Elements are different apps. You should be able to install them side-by-side without any conflicts. However, I'm not sure if you can launch both apps at the same time. That might pose a problem.
Retrieving data ...