I have bought the 1 PC license and used the serial key on my installed bandicam program and today, when I run the program, it says that it is unregistered.
I have not installed this on another computer or anything, and have tried using the same serial key on the same computer with no positive effect other than an error screen telling me to check my e-mail address and serial key.
So I paid for something and installed it properly, and now it has reverted back to the unregistered version.