Hi marr_lizz,

Do you run the latest version of macOS?

Unfortunately, there is a problem with macOS 10.13 High Sierra - games using Wineskin, such as Blackwell series might have stopped working with this update. We are working on addressing the issue but there is no ETA when this work will be done.

In meanwhile, here's a workaround that you might try: http://wineskin.urgesoftware.com/tiki-view_blog_post.php?postId=87

If that won't help, please write to our support: https://support.gog.com