I don't own bytecoin.biz, so I've have to put them on the github release page for download:
https://github.com/bytecoin-crypto/bytecoin/releases/tag/v27.0.1
bc1c8f9db7696953511c12464a888357a1543dce5c79d5ca4cf7a7d167377f04 bytecoin-27.0.1-win64.zip
There appears to be an error in your compilation. Bytecoin Core is looking in AppData\Roaming\Bitcoin for it's data instead of AppData\Roaming\Bytecoin.
Thank you for letting me know.
I've downloaded, unzipped and run bytecoin-qt.exe in my desktop, laptop and also a fresh Windows 11 development environment in a VM; and it starts syncing with the bytecoin network fine.
I'm using Windows 11 64bit Home edition, version 23H2. I'm unable to replicate the error this end.
I'm afraid I'm going to have to trouble you for more in-depth information what's happening. Does it start syncing or just doesn't start at all? Have you tried a custom datadir path? What version of Windows are you using etc...
Classic "works on my machine" problem.
Running Windows 10 Pro, x64 ver 22H2, 32G ram lots of HD space.
Error message is displayed on startup,
Error: Cannot obtain a lock on data directory C:
\Users\(computer name)\AppData\Roaming\Bitcoin. Bytecoin Core is probably already
running.
Have a Bitcoin Core running on that AppData directory. Current Bytecoin Core 0.8.1 is on \AppData\Roaming\Bytecoin. Copied the Bytecoin v 0.8.1 directory into C:\Program Files. Then copied over the v 27 bin to C;Program Files.
How do I get v 27 to look for it's files on \AppData\Roaming\Bytecoin?
The data directory structure for v27 is totally different now from v0.8. Seems to me v27 is attempting to access the old \Roaming\Bytecoin directory and getting confused because v0.8 stuff is inside it.
What I would do is rename the current v0.8 \Bytecoin directory (say to something like Bytecoin_backup), so the \Bytecoin directory doesn't exist. Then when v27 starts up, it will create a new Bytecoin directory and use it's own structure. Of course v0.8 won't work then, but any old wallet(s) should be able to be imported once v27 is working.
And alternate idea would be to add the -datadir=
However, you would need to include this everytime you start it up, or it will look somewhere else for the data directory.
Don't forget to backup your wallet if you start deleting directories.
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.