Standard vs. Pro

The Standard Edition of Beyond Compare is a powerful, full-featured comparison tool.  The Pro Edition includes all the Standard features and adds these:

In trial mode you can use both Standard and Pro features.  Upon registering, the license key unlocks the appropriate features permanently.

If you choose the Standard Edition license, you can upgrade later to Pro for the difference in price.

BC version 2 does not have a Pro Edition:  It is comparable to a Standard Edition.