>> I've seen that it is free for 1 month only and after it will be on subscription. no?

No! :)

R3F Free version will be fully functional, but:
- you will not have access to Tool Tips, Site Tutorials, Forum and Instant help
- everytime you will launch R3F you will see splash screen "Free version" and have to wait about 6-9 sec till it will be closed
- It has "FREE" button.

Does it more clear ? :)