Question: When I try to launch Max Payne 3, it tells me an update is available, but when I try to update it says "NSIS Error: Installer integrity check has failed. Common causes include incomplete download and damaged media. Contact the installers author to obtain a new copy."
Answer: First, delete your computer's temp files: Start->Run->%Temp%.
If that does not fix the issue, try uninstalling Max Payne 3 and then Social Club. Reinstall Max Payne 3 and allow the game to set up and update Social Club.
Note: Anti-virus programs may remove or quarantine necessary installation files. Please verify that there is not a conflict, and if needed create an exception for Max Payne 3/Social Club or temporarily disable/uninstall. If you do choose to uninstall, try Microsoft Security Essentials (free) during installation to ensure you still have protection.
The NSIS errors may occur under one of the following conditions: 1. Software files downloaded from the Internet are not complete. 2. Downloaded software files have been modified from the original version. 3. Your PC is infected with a virus. 4. Physical media being used to install the program is damaged. 5. Required hardware (For example, CD/DVD drive) is malfunctioning
Another workaround: 1. Open Command Prompt window, to do so, click start windows and in the search bar type cmd.exe and right click on it and run it as administrator. 2. Drag your installer file into this window. 3. Press the space key once and type /NCRC and then press Enter.