Problem adding high FPS video to project

My Adobe Premiere Elements 2019 works very well except for one problem and that is that it will not load GoPro video at the highest FPS rate.  I can add 1080 at speeds up to 120 fps and 4K at speeds up to 30 fps but when I try to add 1080 shot at 240 fps or 4K shot at 60 fps it will not add it and says something about not having the right codec.  My computer is very capable of handling it as it has an AMD Ryzen 7, 2700X, 8Core 3.7GHZ, 32 GB RAM, a XFX Radeon RX 570 w/ 8 GB Ram.  Operating Windows 10 home 64bit.  I've also downloaded and installed the HEVC Codec per the adobe instructions for people having problems with the Premeiere Elements 2020.  I can view the files with VLC, but not slow them down for a slow motion effect, so the files are there and accessible.  I would really appreciate some assistance with this.  Incidentally, I recently built my computer and brought the software over on the SSD in my old computer, but all other hardware is brand new a few weeks ago.