upgrading to joomla 4, errors 0 Class 'Joomla\Console\Application' not found

[Webdongle]

When you have restored your backup you need to make sure you restore it to an empty folder and empty database. Then you need to make sure all non compatible 3rd party extensions are uninstalled (that includes non compatible 3rd party templates).

[ShlomoWer]

I'm able to revert the site froma backup (the host tells me to delete the app (site ) and then revert from backup, so that it is clean)
funny thing ,
I found that the adsmanger is no longer supported.I was able to uninstall al adsmanger components except one, the first , the administrator component
Another product,
jumi administrator componen
and
site module, I also have trouble uninstalling?
There is also
System- jumi
and
system - Jumi Router ?

[ShlomoWer]

Sorry
the last 2 jumi products I could uninstall but not the first
The administrator component and site module?

[Webdongle]

I'm able to revert the site froma backup (the host tells me to delete the app (site ) and then revert from backup, so t...

So long as they restore the database that belongs to the files. Otherwise you could have a mismatch of files/database

[ShlomoWer]

Is it enough to disable the non compatible extension?
My host support directed me to database mangement, but I am afraid to use the phpmyadmin tool

[Webdongle]

If you use Akeeba to transfer your site to localhost you could try updates with different extensions disabled without fear.

[ShlomoWer]

You mean local host on my computer?
I had so much trouble trying to install the wamp server, I gave up

[ShlomoWer]

Hello,
I was sure I had gotten rid ofall outdated extensions and my upgrade would work
but I tried it now and had an error

[ShlomoWer]

0 Class 'Joomla\Console\Application' not found

[Webdongle]

You can look for and set 3rd party extensions to inactive in the database. Or recover with your backup (so much easier if you used Akeeba even if you don't use it to transfer to localhost)

[ShlomoWer]

I tried again to run the upgrade and recived the following error
0 Call to undefined method Joomla\CMS\Application\AdministratorApplication::isAdmin()
(before i ran the upgrade there was a warning about a temp php file not being set