This is Capcom's officially released patch for Legends 2's PC port. From their patch notes (Google translated from Japanese to English):

• Equipped with "Maximum Buster" from the start.
• Physical strength is at MAX
• The amount of Zenny you earn will be doubled.

How to install (again, translated from their archived website):

a. Download the patch file (dash2patch_easy.exe) to your desktop or any folder of your choice. (Note: This may or may not be accurate. To be safe, extract to where the game is installed)

b. Double-click the downloaded file (dash2patch_easy.exe) to automatically update to the latest data.

(Note: In order for the patched version to run, you MUST have the original disc image mounted, otherwise, the game will give you an error and won't launch.)