The 98street.zip file you have requested: Add Ons / Campaigns / Street (1.96) - 1.77mb is not available. Perhaps try browsing all files for the game ARMA: Cold War Assault and upload any files you want to share or are missing. This is the only information we could locate:
Install: Just copy StreetEn.pbo in the Campaigns folder, and put AddOns in the source: OperationFlashpointResAddOns. AddOns: Mafia pack (dkmm_m500.pbo and J.pbo), Lincoln LS (LincolnLS.pbo) and Black Lincoln Town Car (CWKLCBN.pbo). You also need OFP This is campaign Street, a mafia campaign.