Installation Error(Opencv-python version doesn't match requirement)

I already installed all the dependencies, but when i run 'pip install manimlib' i get the following error:

ERROR: Could not find a version that satisfies the requirement opencv-python==3.4.2.17
ERROR: No matching distribution found for opencv-python==3.4.2.17 (from manimlib)

I already edited the requirements.txt and removed the version number for opencv and tried to install opencv separetely (I already have the most recent version), it didn't work. Also, i wasn't able to install the required version by running pipinstall with the version 3.4.2.17 as argument.

There are some similar issues here, but none received a answer that worked for me. Someone please help.