Unlike other games in the series , it never received a version for Windows and was the final iteration in the '' Half - Life '' series to run on GoldSrc , with '' Half - Life 2 '' and all titles succeeding it running on the Source engine .
Unlike other games in the series , it never received an official version for Windows , however an unofficial version of the game was released by independent developers in 2008 . 
 Decay '' was the final iteration in the '' Half - Life '' series to run on GoldSrc , with '' Half - Life 2 '' and all titles succeeding it running on the Source engine .