Boot Camp Support Software 4.0.4255
System Requirements:
- MacBook Pro (15-in, Mid 2012) 
- MacBook Pro (13-in, Mid 2012) 
- Windows 7.32 bit 
File Size: 1 GB
This download contains the Windows Support Software (Windows Drivers) you will need to support Windows 7 on your Mac.
For more information on which operating systems are supported on different Mac systems, click here. : http://support.apple.com/kb/HT5634
- The download file is a .zip file. Double click it to uncompress it. 
- Double-click the Boot Camp disk image. 
- Copy the entire contents of the .zip file to the root level of a USB flash drive or hard drive that is formatted with the FAT file system. For detailed information about this update, please visit: http://support.apple.com/kb/HT5628 
- When running Windows, locate the Boot Camp folder on the USB media you created in Step 3 and double click to open it. 
- Double click on setup to start installing the Boot Camp Support Software. 
- When prompted to allow changes, click on Yes and follow the onscreen instructions. 
- Installation can take a few minutes. Don't interrupt the installation process. When installation is complete, click Finish in the dialog that appears. 
- A system restart dialog box appears. Click Yes to complete the installation. 
For more information on Boot Camp, click here www.apple.com/support/bootcamp