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I found several issues with the download manager (not the installer itself) at the bottom of this page http://www.adobe.com/products/reader/dlm/
Download the full installer from this link and try again: http://download.adobe.com/pub/adobe/reader/win/8.x/8.1.2/enu/AdbeRdr812_en_US.exe
When you install Adobe Acrobat 8.1 or later or Adobe Reader 8.1 or later on Windows Vista, you see the following error message during the installation process and the installation fails:
Error 1935. An error occurred during the installation of assembly
"Microsoft.VC80.CRT, version = "8.0.50727.163", type = "win32", publicKeytoken = "1fc8b3b9a1e18e3b". processorAchitecure = "x86".
A 1935 error is one of the most common problems that can prevent a user from being able to install any application that uses the Microsoft Windows Installer MSIAssembly and MSIAssemblyName tables to install assemblies. In general, this error means that Microsoft Windows Installer encountered an error while trying to install assemblies to the Global Assembly Cache (GAC) or the Win32 GAC (WinSxS). This error is considered fatal and causes setup to fail and initiate rollback.
The error can be caused by a variety of reasons:
Another application deletes the file while our application tries to open this file.
Some driver in the file system stack intercepts a CreateFile/ReadFile etc and translates the error code to "file not found" etc.
Solution 1: Clear the transaction log.
If you receive a 1935 error when you try to install Acrobat or Reader, the Windows file system transaction log has become corrupted. The transaction log is used by the Windows file system to recover when a file error occurs. To correct this install error, you need to clear the log.
1. Open an Administrator command prompt: Right-click Start > All Programs > Accessories > Command Prompt and select "Run as Administrator" and click "Allow" for the elevation prompt
2. In the command prompt, type the command below:
fsutil resource setautoreset true C:\
This assumes that C: is the drive in which Vista is installed. If it is installed on another drive like D:, please change the drive letter appropriately.
3. Reboot the system.
4. Install Acrobat or Adobe Reader again.
the link is on the adobe website knowledge base
if the ablve steps does not work there is more of the steps in it