Written for Synergy 3 (v3.7.2) and Synergy 1 (v1.21.4), checked 3 October 2026.
Product: Synergy 1 and Synergy 3
Operating system: Windows
When trying to install Synergy 1 or Synergy 3 on Windows, you may see an error message saying "Service cannot start". To fix this, install the latest Microsoft Visual C++ Redistributable, then run the installer again: Latest supported Visual C++ Redistributable downloads
The same fix applies if Synergy 1 shows a Dependency Error window saying the installed Microsoft Visual C++ Runtime is outdated.
This shouldn't happen, since the Microsoft Visual C++ Redistributable is actually packaged together with our Windows installer, but there are some situations that cause Windows to have problems with the packaged redistributable.