Seasons greetings and thanks for this rapid response.
If open access with required registration is the only way to do this I guess we will have to try it, but it may not quite solve our problem. We would like to offer a free subscription for the first issue, which is now a year old. When the second issue is produced later this year, we would like to charge for that issue. We would like to continue this practice subsequently so that, after a period of time, the second issue will also be available on a free subscription but the third will require a paid subscription, and so on. So we don't want to disable subscriptions, rather we want a special type of subscription, which is a free subscription.
I don't think this is quite the same as open access but correct me if I am wrong. In order to access the journal, we want the reader to go through a subscription process which is distinct from registration. We want to see the user's name (and email) as a 'subscriber' in the subscriber list, so that we have a base list of subscribers for mailshots and so on.
We may also want to make free offers to selected groups of people (for example, members of various organisations) from time to time, so a category of 'free subscription' is needed. And in theory it ought to work, except it doesn't, for the reasons give above.
I've seen a previous post on this at viewtopic.php?f=8&t=8314#p32443
and maybe the solution lies there. But this seems to involve modifying the code which I am reluctant to do.
Also it is simply puzzling that when the user is asked to send confirmation of manual payment, she gets a 404. Is this a known bug or a problem with our installation do you think?