I've read through posts back to 2015, but not sure I found one that specifically addresses my issue, which was self induced by a novice.
I downloaded Classic from the site from Feb., running 3.7 Moodle with I understand had Classic in the core. Made some changes to the downloaded Classic. Tried installing it, then get the Plugins requiring attention message.
From other postings, can get back to the Plugin install page, but without a current Classic to install, it means nothing.
Can I find a current Classic somewhere? If not, what am I going to have to do to correct this issue?