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I've already installed STKO and OpenSees with out problems. But I don't know how to make them work together. It seems like STKO can't find the solver, and I've tried to fix it unsuccessfully. Is there any tutorial video, or any guide? Thanks un advance.

You have to use the Kits command in the Analysis Tab to set up your solvers.
If you click on Help -> Manual, you can find info about it: Note that:
1) If you install the OpenSees-solvers (unofficial 3.3.0) version from Prof Tarque's website, you will have an easy Windows installer for OpenSees, OpenSeesSP and OpenSeesMP (parallel versions). This installer will install all solvers in a location (C:\OpenSees-Solvers) that STKO finds automatically.
https://www.pucp.edu.pe/profesor/sabino ... ducciones/

2) otherwise, if you use your own OpenSees, you need to import the solver using the Kits command.

3) Note that, in the latest OpenSees version (3.3.0) the MPCORecorder has been disabled by mistake by the official opensees compilation.
So the best option is to use Option 1)

Thank you very much for the great explanation.

You are welcome!