There is no official "Patch 1.8" for the original Call of Duty 4: Modern Warfare (2007)
The patch was going to address several issues that had been plaguing the community, including frustrating bugs, annoying exploits, and imbalance in multiplayer modes. Players had been clamoring for fixes, and the team was eager to deliver. cod4 patch 18 top
If you are still running the vanilla 1.7 version, you are missing out on: There is no official "Patch 1
: Implements more effective ways to deal with cheaters compared to the now-obsolete Punkbuster. Feature Enhancements including frustrating bugs