Hello. Why i get this error? Can you help me? I create new folder, then python -m venv .venv, then python local 3.9.4, then pip install meltano But in same time i run meltano --version and get response meltano, version 2.9.0

Have you tried running

pip install --upgrade pip

as recommended? After that you will probably want to run

pip install --upgrade meltano

too.

It seems to me that the problem is that I have meltano installed globally somewhere and it takes it from where, but I don’t know if this is normal

I've seen that error before. I think it has something to do with the older version of pip trying to install older versions of dependencies. You may just need to install the postgres client libraries, e.g.

brew install postgresql