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#21
Use MiniTool Partition Wizard Free again to extend C: drive. Right click on C: drive and click Extend. That should give you the option of adding the unallocated space to it.
Glad it all worked out for you! mbr2gpt is very fussy and everything has to be just exactly correct for it to work. It doesn't really have to be that hard, I don't know why MS made it as hard as they did. And, as you tell, the third-party software companies swooped in and will make you pay for the answer.