Specifically, what bug was that and how were you informed?
For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info.
Older versions are available here. Ignore any virus prompts. And your old installer should be found in this path on your PC...
"C:\Program Files (x86)\NCH Software\VideoPad" or similar, but without the (x86). Re-register it if necessary.