My company wants to check if FlashPro is free or not. Does it require any license? Can you offer any official document to explain it?
No, the application is not free. It actually requires a license and it requires purchasing. Here is the table from the Ordering page provided by the developers of the application:
You can find additional information if you visit the following website: http://www.microsemi.com/products/fpga-soc/design-resources/programming/flashpro#ordering