Navigate to the folder and launch left4dead.exe. If nothing happens, run as Administrator and install _CommonRedist\DirectX\Jun2010\DXSETUP.exe.
For reference:
A 186MB total implies that over 90% of the original game has been stripped away. Many repacks labeled "186MB" are actually just installers that download the rest of the game in the background, or worse – bait for malware. download left 4 dead 1 highly compressed 186mb work
This number is not random. 186MB is the threshold for many free cloud storage services (MediaFire, Mega’s free tier) and fits easily on a single CD-ROM or USB stick. It is also small enough to download over a mobile hotspot in under 10 minutes. Navigate to the folder and launch left4dead