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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.