Heya, Recently downloaded ready project: simple 3rd person shooter with AI zombies. So the question is how to increase their quantity? Do i have to increase the frequency of spawning or what? Would be grateful if somebody could explain it step by step.
Hi, best to answer to those trying to help you instead of asking the same question again 
Would be grateful if somebody could
explain it step by step.
Nobody can do that without knowing how it is implemented in this specific project, since what you would need to change depends on how it is implemented. It could be as easy as changing a variable somewhere or as hard as rewriting the whole spawn logic or anything in between.
If it is a marketplace project then you could ask the creator.
If it is not a marketplace project, then my next question would be the same as from the post linked above, so best for you to continue there. But unless you find someone who uses the exact same project or is willing to look through a whole project (unlikely) the last resort would be to brush up your blueprint knowledge to be able to do it yourself or at least to be able to provide more specific information about the problem you encounter.