The path to OpenSSL is in the phpinfo button. With the site active, from Local, click on the “circle I” (info) icon next to the php version. It will display the php info page. Somewhere on that page you will see an entry for OpenSSL. There will be a file path. Use that one.
Sorry I’m on my iPad, no images for help.
I had this issue too. I had to got back to the MainWP setup wizard. I think I had to select localhost > Windows even though I was on a Mac.