I have been running Avenza for the last 4 years. I recently had to get a new phone, so in the process of re downloading the maps for the hills. The only way to find them is to search by the name of the Ranger district in the store:
“Mystic Ranger District MVUM”
“Northern Hills Ranger District MVUM”
“Bearlodge Ranger District MVUM”
“Hell Canyon Ranger District MVUM”
They do have the 2018 versions up. What I really like about them is you don’t have to have cell service and it puts your GPS position right on the map. They have proved to be very accurate for my use.