starting issue – .toml file missing/deleted

Hello,
on the first start after installation the program wants to re-build the `dnscrypt-proxy.toml` and nothing else happens.
On the second+ start it tells me that there was no `dnscrypt-proxy.toml` file and the prog should be installed again. But re-installing doesn't help.
Copying the example-file into the dnscrypt-proxy directory doesn't help either. The file is deleted/renamed to `dnscrypt-proxy.toml.bak` during next start of the program and the re-building dnscrypt-proxy.toml message shows up again:
Logfile says:
`2019-04-13 12:50:12.1189 LoaderViewModel System.UnauthorizedAccessException: Der Zugriff auf den Pfad wurde verweigert. (german for: access denied)
bei System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
bei System.IO.File.InternalMove(String sourceFileName, String destFileName, Boolean checkHost)
bei SimpleDnsCrypt.ViewModels.LoaderViewModel.d__8.MoveNext()`
Program version is 0.6.4 x64 on Win7