There's a bit of acrimonious debate over at CSA2 about distributing ProTerm, so I'm not going to post the 5.25" disk images... however, the manual does describe the procedure for creating a 2-sided "flippy" disk from the official release. Page 57.

Of course you still need some way to unarchive the Shrinkit file and jump through all the usual hoops to get it to your Apple II.