For molecular modelers, software updates can occasionally bring about changes that affect workflows or compatibility with certain plugins and extensions. If you’ve ever needed to revert to an older version of SAMSON, the integrative molecular design platform, this practical guide will help you navigate the process with ease.
Why Install an Older SAMSON Version?
There are various scenarios where this might be useful:
- You’re working on a research project that requires compatibility with specific extensions or tools supported only by previous releases.
- Newer versions of SAMSON might have features that conflict with your existing workflows.
If you find yourself in such situations, follow the steps below to safely install an older version.
How to Choose and Install an Older Version
The process of installing an older version of SAMSON is supported directly through the application installer. Here’s how:
Step 1: Obtain the Installer
You can use the same installer for newer and older versions of SAMSON. If you don’t have it, download the installer from SAMSON Connect.
Step 2: Select the Option for an Older Version
During the installation process, you will arrive at a step where you can select “Install an older version.” This option is visible on the screen at the second step of the installation process. Check the box to proceed. Refer to the image below to locate the option:

Step 3: Choose Your Preferred Version
At the next step, you will be presented with a list of available versions. These versions are identified using developer version numbers. For example, version 2.0.2 corresponds to the 2021 release of SAMSON. If you are unsure which version you need, you can consult the User Guides for other SAMSON versions. Select your desired version and follow the remaining steps to complete the installation.

Launching and Managing Older Versions
If you install multiple versions of SAMSON, you may want to launch specific versions depending on your workflow. Here’s how to do it on different operating systems:
For Windows:
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C:/Users/%USERNAME%/OneAngstrom/SAMSON-Application/10.0.0/Binaries/SAMSON-Core.exe |
For MacOS:
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$HOME/Applications/SAMSON.app/ |
For Linux:
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$HOME/OneAngstrom/SAMSON-Application/10.0.0/Binaries/SAMSON-Core.sh |
Following these paths will help you access and run the specific version of SAMSON that you have installed.
Conclusion
Installing and managing older SAMSON versions can simplify workflows and support compatibility with specific extensions or tools. This feature ensures flexibility for researchers and molecular designers who rely on stable software versions. For more details, visit the official FAQ page.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. You can get SAMSON at SAMSON Connect.
