Michael Ferris said
Sounds good. But I want to clarify some steps.
I’m going to rewrite your instructions and anything I have a question on, I will put a question mark afterwards. If you could give me a yes/no to those, that would be appreciated. And correct anything else you see as incorrect and / or out-of-order.
1 – Deactivate V5
2 – Delete V5 folders?
That’s a good question and really has two answers! The simple-press plugin itself should be safe to just leave as long as it is deactivated. If, as I suspect it did, it created the ‘sp-resources’ folder under ‘wp-content’ then it is probably worth leaving that in place – I have performed many test upgrades from V4 to V5 with those folders left in place with no apparent issues resulting. I think that should be safe.
3 – Download V4.5.1
4 – Install V4.5.1 via FTP?
Yes – that is the only way.
5 – Restore ALL sf tables from the V4.3.5 back-up?
Yes. I would add a step before you do this. I would remove all current ‘sf’ tables from your working database before you restore the older ones. The reason for this suggestion is that V5 does create some new ones and it would be better to have those recreated at step 15 below.
6 – Activate the V4.5.1
7 – Upgrade the V4.5.1 from admin
8 – Should the forum be functioning correctly at this point?
Yes it should. Version 4.5.1 should work OK with the latest version of WordPress. So fingers crossed that it does!
9 – Create a database back-up while on V4.5.1
10 – Download V5
if you did not remove it at step 2 then you will still have it in your WP plugins folder…
11 – Install V5 via WP?
if you DID remove it in step 2 then I would still use ftp at this stage.
12 – Deactivate the V4.5.1?
Yes
13 – Delete the V4.5.1 folders?
Again it should be safe to leave until you have finished as long as it is deactivated. As a general rule, of course, it is always good policy to remove any plugin not in use.
14 – Activate V5
15 – Upgrade V5 from admin
Oh gosh – I hope this goes well!