I don't get what was so difficult.

All I did was rename the old QT (and my wallet.dat, though this wasn't necessary), pasted the new QT into the same folder as the old one, and ran it like normal, using the the same data folders and files.

Everything worked as it did before. I did not lose any coins. My old wallet.dat wasn't replaced. I didn't have to import any keys. It just worked.