You're looking for a comprehensive map pack for Counter-Strike 1.6. The "Ultra Map Pack" you're referring to seems to be a collection of 1440 maps for the game. Here are some key points to consider:
Start Counter-Strike 1.6. Open console (press ~ ) and type: You're looking for a comprehensive map pack for
The Counter Strike 1.6 1st Ultra Map Pack is a comprehensive collection of 1440 custom maps, carefully curated to provide players with an unparalleled gaming experience. This massive map pack includes a wide variety of maps, ranging from popular community favorites to rare and hard-to-find gems. Whether you're a seasoned pro or a newcomer to the world of Counter Strike 1.6, this map pack has something for everyone. Save Time: No more searching for individual maps
The Last Seed
Avoid “installer.exe” from unknown YouTube links. Look for on archive.org or CS map preservation forums. A clean repack is usually around 2.8 GB compressed / 4.2 GB extracted . Checksum available in community Discord servers. Start Counter-Strike 1