Total Commander

What's the deal with app versions on Aptoide as opposed to Google Play versions? Are they to be trusted or not? For example, I have the latest official version of Total Commander for Android, 3.20; however, on Aptoide it says they have 3.21b1. Is that official from Christian, or some fork?

That's the latest beta. Please follow the steps described here to get the beta via play store:
https://www.ghisler.com/android.htm#download
"To get the beta from the Play Store:"