Can't read raw files

If you have Photoshop Elements 2020, version 18.0, the current one, the D90 is supported.

If you have Photoshop elements 2018 version 16.0, then that version is too old. If you don't want to pay the upgrade, read this:

https://community.adobe.com/t5/photoshop-elements/faq-will-photoshop-elements-work-with-my-camera-or-why-won-t-my-raw-files-open/td-p/4303022?page=1

Download and install the DNGconverter mentioned in that faq. That standalone app, not a plugin will batch convert a whole folder of your CR3 files to the DNG raw format that your PSE 2018 can read and edit. An additional batch step, but free with the same quality.