It's a mod of the official Falcon BMS 4.35 Israel theater (just like Israel1980s), optimized for 1980s-style TvT operations by nerfing aircraft avionics and systems, as well as limiting loadout options in order to provide a foundation for hosting both balanced and asymmetrical TvT events.
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Download and install the official Israel Theater Of Operations for BMS 4.35 (currently version v1.05.4 for BMS 4.35 U3). This is required to use Israel 1980s TvT, since it allows the latter to only require 140MB of disk space by referencing all other 8GB of terrain/texture files from the official Israel theater;
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Unzip "Add-On Israel1980s TvT" into "Falcon BMS 4.35\Data";
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Open the "Falcon BMS 4.35\Data\TerrData\TheaterDefinition\theater.lst" file and add the line "Add-On Israel1980s TvT\Terrdata\theaterdefinition\Israel1980s-TvT.tdf";