It should run just fine. I've tested it several times on my Pro X in response to this thread.
Could you post a screenshot of the error? I assume you are able to install it without error? I don't actually use the app myself, so what I've tried is what is available to download (as opposed to some older version you might have previously downloaded) - I've tried a late build of version 4 (back in November) and now version 5 which is what is currently available to download now.
I just installed it again and it opens just fine: