I thought I had the problem solved but this is what is happening.
I have Photoshop Elements 19. I can not import raw. I managed to import some, but no more. I changed from large picture size to medium and it worked for 2 photos.
It seems like Elements is not responding to my downloads. I download, they end up in a zip file and I get stuck processing from there. I have Windows 10 and I tried from Edge and Chrome. Chrome is my default and I deleted and reinstalled Elements 19 today. The reinstalled version is still ACR 10 something. I have been trying to install 11.4 and it's not taking. I wonder, could it be Norton causing a problem.
Zip file? That means you are trying to download the ACR plugin for the full version of Photoshop to install on Elements. That's not possible, those versions are different. There is no download for recent Elements versions, the ONLY way is to use the menu Help >> Updates to install the specific Elements ACR version. The option is greyed out if there is no update available. Since PSE2019, you should be notified automatically that an update is available.
"I can not import raw."
??? we need to know two things: your current ACR version (menu Help >> about plug-ins) and the models of each of your cameras producing raw file. Each camera has its own raw format. It also might help if you copy and paste here the first 15 or 20 lines of the dialog you get with the menu Help >> System information.