Support

All the software you mentioned have been end of life for years. They are not compatible with Joomla! versions newer than 3.8 (some of them even earlier versions). They are completely inert code; they are not used anywhere.

The FOF 2 library was first released in late 2012. A few months later, the Joomla! project decided to include it with Joomla! 3 itself. This is the FOF 2.4.3 package you see. We discontinued all support for FOF 2 in June 2016; that's just over 8 years ago. Joomla! kept including this End of Life version of our library up to and including Joomla 3.10; we had no control over that, and I had frequently expressed my frustration that Joomla shipped an obsolete version of our software.

Back in 2014 Joomla! proceeded to forbid us from installing updates to our own library on pain of having our software delisted from the Joomla! Extensions Directory (imagine that!), making it impossible for us to update our own software! As a result, we had to fork FOF 2 as F0F in March 2014. Please see https://www.akeeba.com/news/1558-info-about-fof-and-f0f.html. We stopped using it back in March 2015 – that's nine and a half years ago.

In fact, our software for Joomla! 4 and 5 no longer uses FOF at all. We discontinued all versions of FOF back in 2021, having rewritten our software to use the new Joomla! API introduced in Joomla! 4.0.

The System - One Click Action Plugin was discontinued as of Akeeba Backup 6.0, released in February 2018 – that's five and a half years ago.

The Akeeba Backup Notification Module Module 3.7.10 was discontinued as of Akeeba Backup 3.10.2 released in March 2014 – that's ten and a half years ago.

So, yes, these pieces of software are most definitely incompatible with Joomla! 5, and one of them has not been under our control for over a decade.

another thing, i cannot get the search facility for support tickets to do anything, i always get the full list when i press search, even if i type something in to the left. should there be a popup dialog ??  

I am unclear as to what you mean. Can you send me a screenshot?

there is a bug in the akeeba backup doc (should be 2024):  

Thank you!

Please do note that this information is out of date now. It's been revised upwards: https://www.akeeba.com/news/1767-joomla-versions-supported-by-our-software.html 

The old stuff predates Akeeba Backup 8. As I told you, most of that was discontinued sometime between Akeeba Backup 3 and 6. Back then, you didn't uninstall anything. These are leftovers from the olden times.

What I had observed back then is that you could restore backups in such a way that the files of an old sub-extension we had already uninstalled when you updated our software were now put back on the site. Then people would use Discover in the extensions manager, and mindlessly install the end-of-life zombie extensions instead of figuring out this ain't right, these are leftovers which need to be removed from the disk. That's how you ended up with most of these zombie extensions.

The version of FOF 2 included with Joomla was not removed by Joomla on upgrade to 4.x. I have no idea why, since FOF 2 will MOST DEFINITELY NOT work on Joomla! 4. Either they were too incompetent to do this, or they deliberately did this to waste my time. Frankly, I can think of some people over there who couldn't punch their way out of a wet paper bag, and appear to have a personal vendetta against me for no reason, so I will go with "both of the above".

While you were on Joomla! 3 I would've told you to use our Magic Eraser to remove these leftovers. However, once you upgrade to Joomla! 4 or later you cannot use it – because these extensions are incompatible with Joomla! 4 and later, therefore might not even uninstall!

You should uninstall all of the extensions you listed in your original post. None of them are used anymore.

If I remember correctly, in the administrator/modules/mod_akadmin folder there is a file called something like script.php. It is the file referenced in the XML file in the <script> tag. If you delete that file you should be able to uninstall the module.

Then the module is just a phantom entry. You can't remove it using the interface.

You can delete the libraries/fof30 and libraries/fof40 folders. They are no longer used by anything.

not exactly sure what was essential!

All of what you did. Otherwise you'd be leaving behind orphan records in the modules and/or assets tables which can cause all sort of weird issues years later.

i still don't understand where the front end got the version, author etc from...

Joomla! caches this basic information in the #__extensions table record. That's where it gets the information; it's faster than having to read, and parse each individual extension's XML file.