I have managed to get to 5.0.0 (from 4.6.3) on my test server at least. Not sure whether I want to go to 5.0.4 - not sure there's any reason for me to upgrade.
Some things to note:
- I couldn't find a link to /acs-admin/apm/ on the acs-admin page, just a link to /acs-admin/install/, which appears to have different options.
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I had to untick the 4.6.2-4.6.3 upgrade sql script when updating acs-messaging to v5.0.0.
The "install tarball over the top of existing directory" advice in the docs (if you aren't using CVS) isn't the most subtle of approaches, and I did some pruning as above. Probably the best thing to do would be prune the directories that have replacement files first (effectively doing what CVS does). Ideally you'd use CVS.
