If release, then root folder should be next to the app
MODIFY
WalletWasabi.Backend/UnversionedWebBuilder.cs
WalletWasabi.Backend/UnversionedWebBuilder.cs
@@ -9,7 +9,11 @@ namespace WalletWasabi.Backend
{
public static class UnversionedWebBuilder
{
+#if DEBUG
public static string UnversionedFolder { get; } = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..\\..\\..\\wwwroot\\unversioned"));
+#else
+ public static string UnversionedFolder { get; } = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "wwwroot\\unversioned"));
+#endif
public static string CreateFilePath(string fileName) => Path.Combine(UnversionedFolder, fileName);

If release, then root folder should be next to the app