As for the upgrades themselves, only Tech Tool Pro requires a payment (although they have stated that the Big Sur compatible version will be free). Also, if one needs such software for an issue, such software needs to be compatible, especially at the time one needs it. I prefer to wait until such compatibility is there.
Out of curiosity, when was the last time you actually NEEDED to run TTP?
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
