I looked most of them over before proceeding!). Then, after running Clean Master it clearly found a huge number of junk files for removal (yes: real junk. Prior to running the program I used other software to 'clean' my PC. Inside there was the usual plain text file with the activation key which worked to give me a whole year's worth of the Pro version licence. No problem there - got the email straight away and promptly downloaded the zip file.
I had to get the email link as I don't do Facebook. Thank you GotD, this looks like an effective program.
