RockFinder2 is the successor to RockFinder v1 and while the changes might not look that big on first sight they are quite huge behind the scenes. In RockFinder1 I used some kind of custom query builder because I didn't know of PW's built in one (see later). RockFinder2 will exist besides RockFinder1 because I have several projects relying on RockFinder1, but for any future projects you should definitely use RockFinder2.
If you currently live in Russia, please read this message.
Please use RockFinder3: https://github.com/baumrock/rockfinder3