The version in question, v25541371, appears to be a specific build of DCS World that includes all DLCs (Downloadable Content) updated. This version likely offers the most comprehensive experience available, with access to:
F-16C Viper, F/A-18C Hornet, AJS-37 Viggen, and the F-14 Tomcat. dcs world free download v25541371 all dlcs updated
, which was released as a repack containing all paid DLC modules for free. The version in question, v25541371, appears to be