1. Download the game file from your humble bundle download link that was sent to you via email. If you can't find it use Humble order resender to obtain the link. Or, check here for more details on how to access your humble game page. You have downloaded a "zip file", which is a compressed package containing all the game files in it. To play the game, all those files need to be extracted from the zip file. To extract the files: 2. Open the downloaded zip file by double-clicking it. If you have problem with zip files please download 7zip or Winrar. 3. A window will pop up. It will show the contents of the zip file. It will show an EXE setup file, something like "ISG_pre_alpha_XX_setup.exe", and the quick start guide manual.. 4. Choose "Extract to" (WinRAR) or "Extract" (7Zip) and choose the destination of the folder which will hold the setup EXE file. 5. Now close the zip file. Open the newly-extracted folder. You'll see the "ISG_pre_alpha_XX_setup.exe" executable file and the quick start guide manual there. Now you can run the setup to install the game. 6. [Optional] If you want to keep older versions of the game just choose a different installation folder when going through step 5.
