@Jo_Krish Read both these links below carefully.
it is very simple.
Step1: Install UiPath.OCR.Activities package. This package gives you screenOCR and document OCR which are UiPath proprietary OCR engines.
Step2: Install UiPath.ScreenOCR.Activities. This gives you activities specific to screenOcr.
Step3: Go to orchestrator and get API key for computer vision and put it and start using screenOCR. You can use screenOCR engine for all OCR activities.