Cannot load MP4s to Premiere

I am using Adobe Premiere Elements 18.0 (20201207.daily.2234367) with Windows 10 64-bit operating system

When I try to add MP4s shot on a GoPro 7 to a project I get the message "Unable to import media. Your system needs to be configured to import HEVC or HEIF type of media. Click on ‘Learn more' to know how to enable these formats for import."

But I have ensured both the HEVC and HEIF apps are installed.

I also deleted all the files from my C:\Users\Dave\AppData\Roaming\Adobe\common\Media Cache Files folder

I also updated my graphics device driver

I then rebooted my PC and tried to load the MP4 files as media to a Premiere Elements project but I still get the same "Unable to inport media" eror.

Previously I had this problem with MOV files shot on an iPhone. I had to convert the files with HandBrake in order to get them them into Preiere Elements.

But I have never had a problem with MP4 videos shot on GoPro camera. There are over 30 of them so I don't want to have to convert each one. I just want to be able to load my videos into Premiere like I used to.

Does anyone have an idea of what the problem might be?