Renaming the Appdata\Roaming\Bytecoin directory doesn't work. Believe me, v 27 is trying to get it's data from the AppData\Roaming\BITCOIN directory. It's NOT looking in AppData\Roaming\BYTECOIN. It's looking at the WRONG directory for data. it's not going to work unless it can see the correct directory.
Think I've figured it out now.

There's both data and config files. I've only changed the data path to bytecoin and not the config path.
I'm pretty busy this weekend, but should get a new binary out this week, after some testing.
Sounds good.