I downloaded and paid for a key, and I immediately encountered this problem. I looked up a solution on these forums, and the only thing I found was this reinstallment of Visual C++, it worked, somehow, yesterday, but today it doesn't. The only other thing I found was you guys TeamViewing the problem, but I don't understand why you don't post a more wide solution for this problem, when it's often encountered. I have posted this with both before and after logs of the Visual C++ reinstallment.
After reinstalling Hearthstone, Hearthbuddy, Visual C++ 2005-2017, 6 times in different orders, nothing is currently fixing my problem. I tried checking my firewall, even disabling it, didn't work. Tried uninstalling all the programs you say might interfere with Hearthbuddy services, didn't work. I think you need to find a solid solution for this problem, because I am not going to pay for a program that's only working 20% of the time.