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Development snapshots
We recommend running the latest development snapshot build to get the latest bug fixes and enhancements. The development builds are updated more frequently than the general releases below.
Upgrading from an earlier version of PHD2
Just download and run the installer. There is no need to uninstall the older version first. If you do uninstall the older version, you will remove all your profiles and settings.
Note for Gemini/Gemini2 ASCOM users: PHD2 requires Gemini ASCOM Driver Version 1.0.56.0 or newer.
macOS downloads
For macOS 10.14 Mojave and newer, install the 64-bit version of PHD2. For older versions of macOS, install the 32-bit version.
Linux packages
Patrick Chevalley has PHD2 Ubuntu packages hosted on Launchpad. If you are using another Linux distro, you can build PHD2 from source: Building PHD2 on Linux.
Viscosity for macOS
Download Open Labs Drivers
Version 1.9.2 | Release Notes
Requires macOS 10.13 or later.
Viscosity for Windows
Version 1.9.1 | Release Notes
Requires Windows 7 or later.
Installing Viscosity (Mac)
Download Open Labs Driver Windows 7
1. Quit any old copies of Viscosity that are running. 2. Open the Viscosity.dmg file in your Downloads folder. 3. Drag the Viscosity icon to your Applications folder. 4. Eject the Viscosity disk image from the Finder. 5. Launch Viscosity from your Applications folder.
Detailed Instructions
Installing Viscosity (Windows)
1. Exit any old copies of Viscosity that are running. 2. Open the Viscosity Installer.exe file in your Downloads folder. 3. Click Yes to the User Access Control prompt. 4. Follow the instructions displayed in the Setup Wizard. 5. Launch Viscosity from your Start menu.
Detailed Instructions
30-Day Trial
Open Labs Timberland Edition Miko
This download is a fully functional version of Viscosity, which will stop working after 30 days. To continue using Viscosity after this period you will need to purchase a license.
After buying Viscosity you will receive a license code that will activate your copy, so you don't need to download Viscosity again.