Upgrading to PHP 8.0

[Interferon]

I am getting ready to upgrade from IPB 4.5.4.2 to the latest. First, I am upgrading PHP from 7.4 to 8.0. After I do this, I get a 500 Internal Server Error:
The server encountered an internal error or misconfiguration and was unable to complete your request.

I cannot log into the admin panel either. All plugins and extra applications were disabled before changing the PHP version.

[Mark H]

Please download the requirements checker, here:

Then upload it and visit it with a browser while running PHP 8. It will tell you if any necessary requirements have not been met.

Once they are fulfilled, all you should need to do is upload a full set of the system files then run the upgrade manually by visiting your site's upgrade URL directly (i.e domain.com/admin/upgrade/).

[Interferon]

All the requirements are met.

So I should go into the client area, download "Invision Community.zip", and upload all the files, as if it was a first-time installation?

[Daniel F]

Do you see any errors logged in your apache/nginx log?

[Mark H]

Also, please see our guide here:

starting in the sub-section titled "Manual Upgrade".

[Interferon]

I uploaded the files, then navigate to /admin/upgrade, log into my account, pass the requirements check, and it asks for my license key. When I enter my license key it says:

Quote

An installation has already been activated for this license key. Your license key entitles you to one installation only. If you need to change the URL associated with your license, contact IPS technical support.

There is no mismatch between the URL listed in the client area for this key and the install location. They both match.

How to continue?

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Ah, I was missing "www." in the URL. It is working now...

Edited December 9, 2022 by Interferon

[Marc]

Glad to hear you have that resolved 🙂 

[Interferon]

Upgrade is complete. I disabled all optional addons and plugins during the process, then updated and enabled each addon one at a time, testing each one.

The only issue I am having is that our store is displaying an error when you click on the "Software" category:
/store/category/1-software/

Quote

We're sorry, but a temporary technical error has occurred which means we cannot display this site right now.

You can try again by clicking the button below, or try again later.

This occurs even if all add-ons are disabled, using our own custom theme or the default IPB theme.

Edited December 9, 2022 by Interferon

[Marc]

I have created a ticket on this, so we can take a closer look and see what is happening there for you