Acrobat XI Pro system requirements Windows :

* 1.3GHz or faster processor
* Microsoft® Windows® XP with Service Pack 3 for 32 bit or Service Pack 2 for 64 bit; Windows Server® 2003 R2 (32 bit and 64 bit); Windows Server 2008 or 2008 R2 (32 bit and 64 bit); Windows 7 (32 bit and 64 bit); Windows 8 (32 bit and 64 bit)
* 512MB of RAM (1GB recommended)
* 1.85GB of available hard-disk space
* 1024x768 screen resolution
* DVD-ROM drive
* Internet Explorer 7, 8, 9, or 10; Firefox Extended Support Release; Chrome
* Video hardware acceleration (optional)

Note: For 64-bit versions of Windows Server 2003 R2 and Windows XP (with Service Pack 2), Microsoft Update KB930627 is required.

Languages : Italian, Portuguese (BR), Chinese Simplified, Chinese Traditional, Czech, Danish, Dutch, English, Finnish, French, German, Japanese, Korean, Russian, Slovak, Slovenian, Polish, Spanish, Swedish, Turkish, Ukrainian

Homepage :  
http://www.adobe.com/products/acrobatpro.html


Please read instructions
0. CLOSE YOUR INTERNET CONNECTION (IMPORTANT)

1. Install application from "Adobe CS6" folder by double clicking on the "Setup.exe" (With admin rights on your system.)

2. Choose TRIAL install. (IMPORTANT)

3. Select your language. (You can not change it after installation)

4. Open the application as trial version and close. (IMPORTANT)

5. Install update by double clicking on "AcrobatUpd11001.msp" in"update" folder.

6. Copy the patch "adobe.acrobat.xi.pro.patch-MPT.exe" from "patch-MPT" folder and paste it in to the installation folder and RUN. Click on brain shaped button and be sure to see "OK" on patch. Installation folder is generally ;
C:Program Files (x86)AdobeAcrobat 11.0Acrobat
OR
C:Program FilesAdobeAcrobat 11.0Acrobat

7. For your safety Use your firewall to stop internet connection of the application and uncheck automatic updates. Don't update it.

* Some security software will warn you, be relax it is false positive.

** If you can not find patch "adobe.acrobat.xi.pro.patch-MPT.exe" it means, your security software deleted or quarantined it without your knowledge. Open your security software and exclude it OR close your security software and download it again.

Thanks to MPT