Error 1935 on installation of Adobe Acrobat.

Hello Barrett Kalellis,

A couple of things worth knowing up front, since they change the picture a bit.

The "hotfix from a Microsoft Support engineer" route isn't available anymore. That was an older Microsoft Support model where individual KB hotfixes could be requested per-incident through CSS. Microsoft retired that years ago — fixes are now rolled into cumulative updates and .NET Framework servicing rather than handed out as standalone hotfix packages. So unfortunately there isn't a hotfix to request for this one.

Adobe Acrobat X is also end-of-support on Windows 11. Acrobat X reached end-of-core-support back in November 2015, so it predates Windows 11 by about six years and isn't officially supported on it. If you have any flexibility to move to modern Acrobat or Acrobat Reader DC, that's the supported install path on Win11 and Adobe's current Error 1935 troubleshooting KB applies there: https://helpx.adobe.com/download-install/apps/troubleshoot/error-codes-300-and-above/error1935.html

(Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate and safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.) 

If you'd still like to try getting Acrobat X to install on Win11 anyway, the sequence that's worked for others on the same 0x80070091 is roughly:

1. Enable .NET Framework 3.5 via Control Panel > Programs > Turn Windows features on or off.
2. Repair .NET Framework with the .NET Framework Repair Tool: https://www.microsoft.com/en-us/download/details.aspx?id=30135
3. Right-click the Acrobat X installer > Properties > Compatibility > "Run this program in compatibility mode for Windows 7" + "Run as administrator", then retry.

If it still fails after that, the issue is most likely Acrobat X itself rather than Windows servicing, and Adobe Support is the right next stop given the product's age.

The hotfix mentioned in older Microsoft Support articles for Error 1935/HRESULT 0x80070091 is no longer distributed directly by contacting a support engineer. For current Windows versions, the supported approach is to fix the underlying .NET/servicing issues that cause Error 1935 rather than obtain that legacy hotfix.

For Error 1935 when installing software (including Adobe products), supported remediation steps include:

1. Repair or reinstall .NET Framework components
   • Open the Programs and Features control panel (appwiz.cpl).
   • If Microsoft .NET Framework 4 Client Profile is listed, choose Uninstall/Change and then select Repair .NET Framework 4 Client Profile to its original state, complete the wizard, and restart the computer.
   • If .NET Framework 4 Client Profile is not listed, install it using the Microsoft .NET Framework 4 (Web Installer).
   • If .NET components appear damaged, the Microsoft .NET Framework Repair Tool and, if needed, the .NET Framework Cleanup Tool can be used as described in the documentation.
2. Run the System Update Readiness Tool (if on Windows 7 or Windows Vista)
   • On Windows 7 or Vista, download and run the appropriate System Update Readiness tool package for the OS version, then retry the installation.
3. Address Office-specific Error 1935 scenarios (if applicable)
   • If Error 1935 occurs while installing Office 2010/2007 or their updates, use the documented methods such as deleting the HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\APPMODEL registry subkey (after backing up the registry), repairing or updating .NET Framework, or stopping Windows Search service when applying Office 2010 SP2.

For Adobe Acrobat X specifically on modern Windows versions, Adobe is the primary support channel. If Error 1935 persists after repairing .NET and system components as above, contact Adobe Support for a current, supported fix path for Acrobat X on Windows 11.

References:

• Error 1935 when you try to install Microsoft Office
• FIX: An installation may fail with error 1935 when an .msi file tries to install many policy files on a computer that has the .NET Framework 2.0 installed
• FIX: "HRESULT: 0x80073715" error when you install an application by using an .msi file if the file is merged with merge modules for the Visual C++ 2005 runtime library