You missed a couple of things in this explanation for Windows users. First is that the new TrezarCoin data folder is located under %appdata%\Roaming, not just %appdata%, and it is, of course, called TrezarCoin, rather than data. To speed things along, copy the existing data subdirectory to c:\users\\appdata\Roaming\ and then rename it TrezarCoin BEFORE running the new wallet program.

Second is that the new wallet is tagged as a trojan by Windows Defender (Fuery.a!cl) but this is almost certainly a false positive (or, I should say, it better be) so this file needs to be excluded from scanning. For those who have not done this before it's fairly simple but you have to dig deep. First open Windows Defender (either via Settings or the up-arrow in the right side of the tray), then click on the "Virus & Threat Protection" shield, then scroll down and click on "Virus & Threat Protection Settings," then scroll down and click on "Add or remove exclusions" to add the file or folder you want to exclude from scanning. Practically speaking, you'll likely have to add your Downloads folder to the exclusion list as well, even though that almost entirely defeats the purpose of having anti-virus software in the first place. M$ fails yet again, is all I can say.

EDIT - I learned something new: "cd %appdata%" does, indeed, go to c:\users\\appdata\roaming, and not just the appdata parent directory! So I struck out the incorrect text above.