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Legacy versions of Fission for older operating systems

We never want customers to feel rushed into updating their computers, so we work hard to provide support for multiple operating system versions in all of our products. Over time, as operating system updates are released, we gradually remove support for older OS versions.

For those users who are still running older systems, we provide a comprehensive library of legacy versions which support older operating systems.

Accessing Legacy versions of Fission

Our Legacy Software page provides access to downloads of legacy versions of Fission, compatible with older versions of MacOS. There, you'll find a list of download links for all legacy versions we have available.

Using older versions of App Store apps

If you previously purchased Fission on the Mac App Store, these instructions from our Knowledge Base can help with moving to the latest direct version.

How do I unlock a legacy version?

All of our products must be unlocked with a license key, and that includes legacy versions. Purchasing a license key through our store will enable you to unlock the current version, and also entitle you to unlock any legacy versions you may need to use.

Most legacy versions can be unlocked with a current license key, but certain very old legacy versions may require a secondary license key. If you’ve purchased a license and need additional assistance unlocking the app, please reach out to us directly.