That makes sense. The mac error is caused by trying to decode the config, could we bring over the gateway but with a blank config?
Thank you both for helping me out! It’s greatly appreciated.
I will try to migrate again on Monday.
You product is really wonderful, but self host maintenance is a challenge 
Br,
Dali
Judging from my efforts so far and the topics of others, migration is not a simple and straightforward task. I have decided to go from the clean v5 version and keep v4 instance for past view.
I did, however, CSV export/import clients, and even here many fields were not transferred and I had to update clients manually.
Nevertheless, both versions work now. I have some questions but will create new topics for other users to find more easily.
Thank you for your help.
Br,
Dali
Glad to hear it’s working now, thanks for the update!
I think one of the main problems here was caused by the APP_KEY being changed, we’ll try to handle this more gracefully in the future. Thanks for your help debugging the issue.