How do I retrieve the previous config for an application?

How can I obtain the Config from a previous release of an application after I have already upgraded to a newer version?

You can use the kubectl kots get config command to retrieve the Config values for a release, and you can use the --sequence flag to specify a historical release.

kubeclt kots get config --namespace superci --appslug superci --sequence 10

If your application contains password type items, these can be decrypted with the --decrypt flag:

kubectl kots get config --namespace superci --appslug superci --sequence 10 --decrypt

See get config | Replicated Docs