@steele I have found the buttons greyed out until I select the appropriate number of objects. For example, subtract requires you to select two objects, then pick which one will be subtracted. Combine works the same way... select the objects to combine first.
I have an old version of 2.19 and the newest alpha/beta on it as well.
You just have to install it in 2 different folders and make sure you are not signing in to the cloud for the settings. Everything has to be stand alone.
@montesdesigns The Z axis thing is an annoying thing by design.... As for settings I think you can either go with a complete Custom printer or start off with one that is similar likce a Cr-10 and customize that one