The seva_suit_upgrades.zip file you have requested: Clear Sky / Mods / Singleplayer / SEVA Suit Upgrade Mod - 2.01kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R.: Clear Sky and upload any files you want to share or are missing. This is the only information we could locate:
A quick mod to allow people to upgrade the last kevlar and psi upgrades on the SEVA suit at either the Clear Sky or Agroprom Stalker Base mechanics.