Adobe ColdFusion customers who do not meet the system requirements for the current version, can purchase a current version of that product, but install an earlier version.
You can request installation media for a previous version and serial number/license key as part of Adobe Volume Licensing (AVL) backwards licensing.
If you are downgrading to the previous version (one version back, such as ColdFusion (2016 release) to ColdFusion 11), and require media or serial key, reach out to Adobe ColdFusion Support.
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