I acknowledge that this answer is based on a very literal interpretation of your question, but just to be thorough and in case it is useful to others looking for answers, here goes.
You can do this with a PC instead of a Mac, as long as you have previous backups of that app on your PC or external backup drive.
To do this, you need to download and install iTunes 12.6.3 (this can be installed with newer versions of iTunes). You will then need to copy the backup version of the iPad app that will work with your iPad to your iTunes library. Then select and sync the version of the iPad from iTunes.
See Distribute Apps in an iTunes Business Environment on the Apple Web site for more information and download links.