The newest version of OBS Studio is 26.0.2, but Patch my PC shows 26.0.0 and always detecting as outdated software
That means you have v26.0.0 installed with v26.0.2 and you must remove v26.0.0
I am getting something similar.
Windows shows I have 26.0.2 installed. But I used OBS to update itself to 26.1.0.
PatchMyPC is showing I need to install 26.0.2