I'm thankful for the bundle and am glad to help these charities, though I purchased the MacHeist3 Bundle for Kinemac only, and have no interest in any of the other apps.
I tried each of the methods described by others here, and still cannot get it to work. I did have an app enhancer and deleted the file to try it as recommended, with no difference in results.
When I right/control click (from the web-receipt page) to save the registration txt file, it's called, "1C1426821P856735R.txt"
If you left (standard) click, it will automatically be saved in the download folder and it is called, "RegistrationFile.txt".
I've tried adding it to the folder several times with each of the two different file names, separately and together, and still no luck.
I am a relatively advanced Mac user and can't quite figure this one out, even though there are others that seem to be successful.
I see that various forum members are replying to each other, which is very nice, though I'm wondering if there's a moderator watching this forum that can point us in the proper direction.