Is it easy to downgrade from version 3.5 to 2.9? I have a client that do not like the interface and don't want to upgrade some plugin's too. And how must I downgrade
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AFAIK there is not a sensible path to downgrade from EE3 to EE2.
Probably better to simply reinstate a backup of your EE2 from before your upgrade to EE3 onto a local server and then patch over whatever changes in content have been made since you did the upgrade, and then put the EE2 version back online.
If you are still at the point where you are trying to work out how to get around add-ons that haven't been migrated to EE3, I suspect the amount of work involved in restoring the backup is not huge.