At least 6 GB of available hard drive space is recommended for a full SQL installation, though the SSRS installer itself is approximately 131.2 MB . How to Download and Install SSRS 2022
An existing instance of SQL Server Database Engine (2014 SP3 or later) is required to host the report server database. At least 6 GB of available hard drive
Run the downloaded executable as an administrator. Select Install Reporting Services . Choose Your Edition: Select an edition to install: At least 6 GB of available hard drive