SolidWorks Freezes During Service Pack Installation: Definitive Fix

Why it happens: technical causes of the freeze

Freezing during a SolidWorks Service Pack (SP) update typically occurs in environments with:

• Conflicts with Visual C++: Residual versions of the MS Visual C++ 2010-2019 redistributables generate incompatibilities with the installer.
• Corruption in Windows Installer: Damaged MSI service databases prevent critical transactions from completing.
• Orphaned processes: Hidden instances of sldworks.exe or SLDDownloadManager.exe monopolize resources.

Step-by-step repair procedure

1. Terminate conflicting processes

1. Open Task Manager (Ctrl+Shift+Esc).
2. End all related processes:
   • sldworks.exe
   • SLDDownloadManager.exe
   • msiexec.exe
3. Check the Services tab and stop SolidWorks Licensing Service.

2. Clean the Windows Registry

Warning: Back up the registry beforehand.

• Delete the keys under HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstall that reference older SP versions.
• Check HKEY_CLASSES_ROOTInstallerProducts for damaged entries.

3. Run the installer with elevated privileges

1. Download the full SP package from the support portal.
2. Right-click the installer and select Run as administrator.
3. Temporarily disable antivirus solutions such as McAfee or Symantec Endpoint Protection.
4. Check the Repair Installation option if available.

Frequently Asked Questions (FAQ)

Does the Service Pack require reinstalling all of SolidWorks?

Not necessarily. 89% of cases are resolved by cleaning up processes and the registry, according to data from Javelin Technologies.

How do I check if the problem is related to Visual C++?

Run vc_redist.x64.exe /repair from the console and review the logs at %TEMP%.

Is it safe to manually delete registry entries?

Only when they are specifically identified as leftovers from previous SPs. Use tools such as Sysinternals for prior analysis.