1. But not even an option to pay.Best hvac app, I was having problems downloading this app until I contacted the developer, To any one having problems, do this: Go to your settings>app>super cool app>storage> clear data and clear cache.
2. You have to uninstall and then reinstall to get the app to work again every 30 days, except when you do this it literally doesn't work and you're no longer able to use this app whatsoever.I couple days ago I would have given this app 5 stars.
3. If this doesn't work try clearing the cache first, then clear the data.
4. PityI love the app when it works and recommended many times however the 30 day trial has been such a pain I no longer want to deal with it.
5. every time I do, it gives me the same 30 day trial expiration, even after I delete cache/memory free up as a previous user recommended.
6. I have followed instructions given (uninstall, remove from library, turn of phone then reinstall) just doesn't work.
7. I never had this problem on my iPhone it always worked just fine on iPhone.Had this installed and then went to use it and comes up as the 30 day trial has ended.
8. I have tried to reinstall several times and still just shows that the 30 day trial has ended.
9. It's just annoying to keep having to uninstall and reinstall every 30 days.
10. If this problem is ever fixed we will use it again.App was listed with the visor slide rule purchase, so I installed it.
11. I have the Super Cool Slide rule but the app is just a great addition and quick reference.