This page, the migration notes, only shows incompatible Werks!. You should read them carefuly all listed werks from the version you are updating from till the version you are updating to. Each of the listed werks might require you to take manual actions to make your installation work properly after an update.
If you like to see all changes related to the single releases, please take a look at the list of All Checkmk Werks.
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You can find a list of all werks including older versions here.