Restrict ‘author’ user from deleting other user posts?

Hi there!

I want to apologise that none us volunteers have gotten back to you yet!

I have found a post describing exactly what you want to do:
https://clicknathan.com/web-design/restrict-wordpress-authors-to-edit-their-own-pages/

It can be accomplished by using Capability Manager Enhanced plugin.

I hope that this helps you!

Let me know if you need any more help.

Best of Luck!

~Josh