Help - I removed asteridex and reminders

I was trying to re-install some of the modules that were reporting as unsigned and wanted a reinstall. So I went into module admin and selected “remove” as the action to perform. Now I lost the module ‘asteridex’ and ‘reminders’ and I can’t see how to re-install these modules. I have tried going back into module admin and checking only and the just don’t show up. Can someone help. Thank you!

Anyone have and idea for me?

This is a question for the PIAF forum: