It now seems that I need to install the AndroidPit App Center to get to my purchase, which would be OK if indeed I could find and install this App Center!
Seemingly I am going around in circles with instructions that eventually lead me back to the same instructions and as yet have not managed to accomplish the objective of installing the App Center on my phone.
PLEASE someone give me a working link to the actual App Center not to the endless looping set of instructions that tell me what to do but don't actually allow me to install it. I even got to Google Play at one point to install, what I thought was, this App Center only to find that the MyApps button on the installed program gave me the identical (and useless) set of instructions on how to install the App Center!
Apologies for the tone but I am very frustrated at this!