Because 2021.7.0 was released shortly after 2021.6, it carries over several significant modern features:
rather than major new creative features. The "Retail-r2r REPACK" designation typically refers to a modified installer version distributed by unofficial software release groups. Key Features and Fixes in 2021.7 Video Engine Improvements Avid Pro Tools V2021.7.0 Retail-r2r REPACK
If you are looking for information regarding this specific release or how to use it, here is the context: Release Details : Avid Pro Tools (Professional Audio Production Software). : 2021.7.0 (Released in July 2021). R2R (Team R2R) Because 2021
The Pro Tools plugin folder is no longer set to "Read Only" for administrators. System & Installation Details Unified Installer Avid Pro Tools V2021.7.0 Retail-r2r REPACK