Instead of looking for a keygen, here is some helpful information about Scapple, its trial options, and how it compares to free alternatives. What is Scapple?
If Scapple is out of your budget, these tools offer similar "infinite canvas" or mind-mapping features for free: scapple-1-0-keygen
Scapple is relatively inexpensive (typically around $20 USD) and is a one-time fee rather than a subscription. Instead of looking for a keygen, here is