Scientific research often relies on software reproducibility. Whether you’re trying to replicate published work, maintain compatibility with existing tools, or avoid retraining a team, there are good reasons molecular modelers sometimes need older versions of software—even in fast-evolving platforms like SAMSON.
Fortunately, SAMSON lets you install previous versions easily, without the need to track down legacy installers or tinker with your operating system. Here’s how to do it, why it might matter, and how to run multiple versions side-by-side.
Why You Might Need an Older Version
- Compatibility with existing workflows: Not all workflows are immediately compatible with new features or updates.
- Reproducibility: Scientific protocols often need to match published conditions, down to the software version.
- Extension dependencies: Some SAMSON Extensions may not yet support the latest core version.
How to Install an Older Version of SAMSON
Installing an older version of SAMSON is built into the standard installation process. After launching the installer, follow these steps:
- Proceed to the second installation step.
- Check the box labeled Install an older version.
- Continue to the next step and choose the version you want to install.
Tip: Versions are listed by developer version numbers. For example, version 2.0.2 corresponds to SAMSON 2021. If you’re unsure which number to choose, you can cross-reference developer numbers using the User Guide Versions page.
Running Multiple SAMSON Versions
If you have multiple versions installed simultaneously, here is how you can launch a specific one:
On Windows
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C:/Users/%USERNAME%/OneAngstrom/SAMSON-Application/9.0.0/Binaries/SAMSON-Core.exe |
On macOS
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$HOME/Applications/SAMSON.app/ |
On Linux
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$HOME/OneAngstrom/SAMSON-Application/9.0.0/Binaries/SAMSON-Core.sh |
This allows side-by-side comparisons or preservation of an older workflow while exploring new features in the latest release.
Installing older versions of software doesn’t have to be a barrier to your scientific progress. SAMSON makes it straightforward so you can stay focused on the molecules that matter.
To learn more about advanced installation options or troubleshooting, please visit the SAMSON FAQ.
SAMSON and all SAMSON Extensions are free for non-commercial use. You can download SAMSON at www.samson-connect.net.