Make address fields 'required' conditional on subscription plan

Most of my plans require a delivery address for mailing a journal - one plan doesn't (download only); is it possible to make the required fields conditional on some plans? At present the address fields are not marked 'required' and print-cpoy subscribers often neglect to provide a delivery address...

You cannot condition the required state of a field. You can only show or hide the field entirely.

I was hoping there was some way in which I could at least force the display of an address fields tab depending on plan. I have created a cb_plan field that is filled on registration but presumably this will only be filled on completion of registration.
. It sounds like the best I can do is to put the address fields in their own separate tab labelled 'Delivery Address'

You can show/hide tabs/fields using CBSubs Fields Tabs Protection. For registration you can use the "Hide fields on registration" parameter under the Workflows tab. If CB Conditional is up to date you can now also configure CB Conditional to condition based off plan selection. So you've a few options on how to show/hide your address fields.

Right! I've used the Conditional to hide the Address tab altogether for plans that don't need an address; that'll do, hopefully. Thanks