Can I upgrade to Windows 11 with Premiere Elements 2020?

Do you have a program to make a FULL backup of your C: drive in case the upgrade does not work?

And by full backup I do not mean just copying the files to a backup drive, I mean a 'clone' of the C: drive that will allow you to do a restore to put the drive back to exactly how it was before you started

Hardware crashes or virus infections or simple software problems happen, so you should buy AND USE software to make a full backup of your hard drive to an external USB hard drive... plus, making step-by-step backups during a new setup or major program addition makes it easy to go back a step if something doesn't work... I have had to do this once when a program install didn't work properly (a different program, not Adobe) and I had to do a restore due to my drive being SO messed up that I couldn't even uninstall the bad program
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This backup and then restore is, of course, only to the same computer with a new drive (or the same drive as long as you don't mind writing over everything) since doing a restore to a new computer requires extra steps due to Windows and many programs having activation information that is keyed to your hardware (which is why Windows will force you to RE-Activate if you change very much hardware)
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There are several backup and restore programs available
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The product I bought and use is at http://www.terabyteunlimited.com/image-for-linux.htm
Note that I get NO benefit if you buy the program, I only use it and like what it does
Version 3+ allows restoring to a larger drive and expanding the partition to fit
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Image runs off of a bootable CD or USB Flash Drive via Linux (the Zip you download includes a program to make the CD or USB, the program uses less than 1Gig) and it reads EVERYTHING on the drive, even the hidden registration information, so everything is restored when needed... and you may not only restore the image over a messed up install, you may restore to a brand new drive in case of a hardware crash, and not have to re-install anything
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I do a backup a couple times a year to a second internal drive... the backup of my C drive is 'about' 45Gig in one file... depending on the space used on your C drive you should be able to do a backup to a USB flash drive that has enough capacity... 128Gig flash drives don't cost a lot
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I have actually done this restore one time... when a program I bought had a faulty installer that totally mangled the Windows registry... I had done a restore before installing the bad program so I did not lose anything when I had to do the restore

I assume you mean upgrade from Windows 10. If so, there's a danger in that an OS upgrade may require a reinstall of the program and your program version may be too old to install. So if you are going to upgrade your OS, prepare also to upgrade to a newer version of the software also.