While a dedicated "article" for this specific version may not exist on mainstream gaming sites, T.A.L.K.E.R. projects:
The file refers to a 2021 release of a modification for the S.T.A.L.K.E.R. series , most likely for the standalone mod S.T.A.L.K.E.R. Anomaly or one of its major derivatives like EFP (Escape From Pripyat) or G.A.M.M.A. . Delta_Zone_Release_210608_v01.7z
For files with a .7z extension in the S.T.A.L.K.E.R. modding community, the standard procedure is: While a dedicated "article" for this specific version