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The zip file format in the links is as "file.zip -> file -> file.dar". The zip file contains an archive which contains the actual dar. You can extract the file from the zip, then open it as archive and then extract the dar from it.
After opening the dar, i see that the version of the dar is 1.1.x. WFA 2.2 does not support upgrades from version 1.1. You can restore then onto 2.0 or 2.1 and then import them again into 2.2.
This is documented in the Installation and setup guide as follows.
You can upgrade to Workflow Automation 2.2 from Workflow Automation 2.0 or later.
If you want to upgrade from Workflow Automation 1.1.x, you must first upgrade to
Workflow Automation 2.0 or later before upgrading to Workflow Automation 2.2.