Error 1935 An Error Occurred During The Installation Of Assembly Component FIX

If you encounter the error message “Error 1935: An error occurred during the installation of assembly component” while installing software via an .msi package, don’t worry — you’re not alone. This error often stems from issues with system files, the .NET Framework, or Windows installation services. Here’s how to fix it step-by-step.

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Why This Error Happens

Error 1935 occurs due to multiple possible causes:

• Corrupt or missing .NET Framework components
• Windows Installer (msiexec) conflicts or disabled services
• Resource/log file corruption in the Windows file system
• Outdated or missing Visual C++ redistributables
• Interference from registry conflicts or orphaned entries

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Fix #1: Run System Repair Tools (SFC & DISM)

Start with system file integrity checks:

1. Open Command Prompt as an administrator.
2. Run: sfc /scannow DISM /Online /Cleanup-Image /RestoreHealth
3. Reboot your system and retry the installation.

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Fix #2: Repair Visual C++ Redistributables

Issues with the Visual C++ runtime often trigger this error. Fix them as follows:

1. Navigate to Settings → Apps → Installed Applications.
2. Find all Microsoft Visual C++ Redistributable entries.
3. Select each, choose Modify, then click Repair.

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Fix #3: Enable the Windows Modules Installer Service

This service (TrustedInstaller) is vital for assembly installations:

1. Press Win + R, type services.msc, and press Enter.
2. Find Windows Modules Installer, right-click → Properties.
3. Set Startup Type to Manual, and click Start.
4. Try the install again.

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Fix #4: Clear the File System Transaction Log

The file system transaction log can become corrupted and block assembly installs:

1. Run Command Prompt as Administrator.
2. Execute: fsutil resource setautoreset true C:
3. Restart your PC and retry installation.

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Fix #5: Repair or Reinstall .NET Framework

A damaged .NET Framework often causes assembly errors:

1. Open Control Panel → Programs and Features → Turn Windows features on or off.
2. Disable and re-enable .NET Framework 3.5, then restart.
3. If unavailable, use the .NET Framework Repair Tool or do a clean reinstallation.

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Fix #6: Run Installer as Administrator in Compatibility Mode

Permission or compatibility issues can block installation:

1. Right-click the installer → select Properties.
2. Go to the Compatibility tab.
3. Enable Run this program in compatibility mode (e.g., Windows 10).
4. Check Run as administrator.
5. Try installing again.

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Fix #7: Delete the APPMODEL Registry Key (Office-Specific)

If installing Microsoft Office and facing this error:

1. Open Registry Editor (regedit).
2. Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\APPMODEL
3. Right-click and delete the key. Confirm and restart your computer.
4. Retry the installation.

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Final Thoughts

Error 1935 can be resolved effectively with the right steps. Start with system file fixes (SFC/DISM), then move to runtime repairs and permissions. For Office, try the registry clean-up. If issues persist, consider clean-booting your system, temporarily disabling antivirus, or seeking support from the software publisher.