Error Upgrade OJS 3.1.1.4 to 3.1.2 "You are trying to downgrade the product "" from version [3.1.1.4] to version [1.0.0.0]"

Software Support
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Update
To be more specific, we get the following error code while upgrading: “ojs2: You are trying to downgrade the product “openAIRE” from version [2.0.0.4] to version [1.2.0.0]. Downgrades are not supported.”

Disabling or uninstalling the OpenAire-plugin did not help.