I created the following rule:
- Event: User votes on a Материал
- Condition: Check the value of the vote, greater than 0
- Action: Load points of a user, node:author
- Action: Grant points to a user, node:author 1
When a user votes on a node, the node author will get 1 user point. The same user can vote more than once, and the node author would get 1 user point each time.
UPDATE. Solved my issue by myself. Will add link to solution soon.