I would suggest making it available outside of the app store. I work for a large company, and we simply cannot use software from the app store since it is tied to an individual Apple ID, and the company has no procurement process for app store software. In addition to that, there are many people who would prefer to install software without having to use the app store.
I browsed around quickly and noticed a lot of calls to /bin/bash and curl via a system() equivalent. That looks a bit dangerous, hope the arguments never contain `special shell characters`. :O
FWIW - it's an open source project and you can always directly get the latest download from github here: https://github.com/saucelabs/sauce-for-mac/downloads
We realize the signup flow is a nightmare, the rules of the app store are not nice :-(