https://support.rockstargames.com/articles/360010842353/Red-Dead-Redemption-2-Installation-Requirements

Red Dead Redemption 2: Installation Requirements
Created October 18, 2018Updated October 18, 2018Print
Question: How much space will I need on my platform to install Red Dead Redemption 2?
Answer: The amount of space required to install Red Dead Redemption 2 depends on the platform you are using, and the method of installation:

Disc Installation:

PS4 - 99 GB installation space
Xbox One - 107 GB installation space
Digital Installation:

PS4 - 99 GB installation space with an additional 50GB for the installation process
Xbox One - 107 GB installation space