As long as you don't violate the EULA, the agreement between you and the dev, you should be good to go. Regardless of how you installed something, the most important is that you have paid for it. Who should sue you, on what grounds and for how much money, btw?
By downloading an cracked version of the software you are indeed breaking the EULA, Those apps had their encryption link remove, allowing access to code that not only the developer intended to be protected but the system count on those process being protected, it have been cases where hacker had modify the installer to add their own code with malicious intentions.
Regardless of who or the amount of money that had been lost (if any), it is not the right thing to do, if the OP or any user have any issues with App that don't work properly, contacting the developer is the right thing to do, you can either get the App replace or your money refund.
If the app is not longer available, then you are again breaking the EULA, since you are having access to something that was purposely removed.