I've done this several times in the past without a problem, until just now with the latest release 1.14.4. Can't recall offhand whether this was done over top of the previous version. This time I tried to uninstall the previous version first, which looked to have worked, but then it turned out that there were some files left over in the MakeMKV directory. The 1.14.4 install complained that the folder was not empty, so I moved those files out to a backup location elsewhere, then tried to redo the install. Never got to where you apply the temporary key, because the program keeps saying that it encountered a fatal error and must terminate. Huh ? So, I was left with NO MakeMKV at all. Not good. [The Win 7 registry does not appear to contain anything from MakeMKV other than the program name and location. (?) ] I managed to put the older files back into the original program folder instead, and this seemed to accept the latest temp key. But this leaves it at ver. 1.12.3. Where did I go wrong, and how to correct this ?
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Run an uninstaller like Glary Utilities or Revo Uninstaller. There are lots of registry entries are left behind by an incomplete/corrupted uninstall.
Edit: I just downloaded and successfully installed 1.14.4. Win 10 X64
Well, I tried it your way -- using Revo 4. Found a lot of leftover stuff, and ripped it all out by the roots.
(With the standard Revo mode: did not look into 'Advanced', the "Hunter" feature, or whatever.)
Re-installed 1.14.4, into Win 7 Ultimate x64. Same result: "A fatal error occurred, and the program will Exit.", or words to that effect. I was lucky to be able to get it back to a functioning 1.12.3. Not very satisfactory . . . .