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All available versions of Checkmk can be found here.
If the version you are looking for is not listed here, please send a request to feedback@checkmk.com with your OS, the required version and the reason why you need that version.

Note: Please keep in mind that a downgrade of Checkmk 1.6 to older versions is not possible.As of firmware version 1.4.0 you need the 1.4+ package of Checkmk. For appliances with older firmware versions, please use the <1.4 package.
As of firmware version 1.4.0 you need the 1.4+ package of Checkmk. For appliances with older firmware versions, please use the <1.4 package.
As of firmware version 1.4.0 you need the 1.4+ package of Checkmk. For appliances with older firmware versions, please use the <1.4 package.
As of firmware version 1.3.0 you need the 64-bit package of Checkmk. For appliances with older firmware versions, please use the 32-bit package.As of firmware version 1.4.0 you need the 1.4+ package of Checkmk. For appliances with older firmware versions, please use the <1.4 package.

By downloading Checkmk you agree to the End User License Agreement and General Terms & Conditions applicable to your Checkmk Edition, accessible at https://checkmk.com/legal. You also agree to the Checkmk export control regulations, in particular you will not pass on the software to persons or companies based in Iran, on Crimea, in Cuba, North Korea, Russia, Sudan or Syria.