Hi Sean, If you move them to the uploads/sermons folder than Church Admin>Media>Add Already Uploaded File will list them all and you can add them manually in.
If there are hundreds, we could come up with a migration script that can grab the data from Powerpress, but I have never used it, so would need a full database back to work it out. I imagine it uses a custom post type so should be relatively easy to do. I’d need the posts and post_meta tables as well as the church admin ones to work it out though!!! Probably easiest to export the whole database using PHPMyAdmin 