I just talked to K7 again via their online chat and they said that it's possible that existing users won't get an upgrade to the MAT version. At the moment, there is no timeframe for that happening, if it ever does. So, you have to purchase a new license to get the MAT version. This is what I just did, as after I updated K7, I was given the option to buy a 1 year Total Security license very cheaply. It cost around $9 US.
If you want to try the MAT version, this is the download link for Ultimate Security.
https://apps1.k7computing.com/Tools/K7us/MAT/setup-eng-us.exe
To use it, if you click on activate, you will be given the option to start a trial.
@bellgamin If you click on Protection Settings in the top right corner of the UI and then click on the downwards arrow at the end of Firewall Protection, you can turn various firewall settings on and off. This may be what you were looking for.