The email with your lic. gives these directions:
"Once unzipped, please do not try to *open* the license files.
PLEASE NOTE: If you purchased licenses for other programs, such as Mach3, the Mach3 addons, or LazyCam, you will receive them in a separate email.
To properly load PC ID licensed products:
1) Save it to some location on the PC that you registered (the Desktop is a good choice)
2) Open the Mill Wizard or Mach4(if using Win 7 or Win 8, right-click on the shortcut icon and choose "Run As Administrator" from the menu)
3) Click on Help> About in the menu bar
4) Click the "Load License File" button on the About screenn5) Browse to the license file and Open it
6) Close and re-open the About screen to check that the license is properly loaded - it should say "Licensed Copy" above the box with the PC ID."
#6). above should read, Close and re-open MACH4 for you to be able to see your lic. just opening and closing the About screen does not do it.....
Scott