Thread:IDiscoverer/@comment-46756280-20200910185151/@comment-31714002-20200912182840

Those two dialogs were never used simultaneously in classic Mac OS:
 * "Welcome to Macintosh" was used from System 1 to 7.5
 * The "Mac OS" splash screen (before Mac OS X) was used from Mac OS 7.5.1 to 9.2.2

If this is something you're not personally familiar with, you should take time to verify and include links to sources when editing those articles.

Going back to the original topic, what did you mean by: "The *Welcome to Macintosh.* and *Mac OS* dialog on startup will not let one run their software."