cualupe

You need to ensure the software itself is switched to https
See the following guide on this
 
 

When you are running PHP8…
Have you confirmed your version of PHP8 meets all of the system requirements (aka run the compatibility checker while actually running PHP8).
While running PHP8, have you used the tool in the support section of your ACP to disable all third party plugins, applications? 

Most often people find it’s a 3rd party application that causes problems. 

Please leave it on PHP 7.4 if that is where you are working but having issues. We can cross PHP 8 later.

The release you're on, 4.7.3, is the latest release compatible with PHP 7.4. If you're receiving a 500 Internal Server Error when changing your .htaccess though, this means your PHP is set in there.
Please ensure you've removed all custom rewrites and redirects from your .htaccess and update FTP access on file as it is currently invalid.
It is also worth mentioning that you have quite an old third-party application installed called "Rules" which has not been supported in quite some major releases and has been known to do some funky things, even when disabled. I would recommend uninstalling that completely.

I’d try the default theme and if that doesn’t work try disabling apps/plugins. 
 
Theme is easy to try. If it works, it’s a problem with the theme you’re using. 

Which version of IPS?

It's certainly possible.  There are several cases where payments are held for manual review by the billing team to prevent fraud.  I would wait until later today when that team is back in the office.  If it does not get fixed after they're back at work...  you can submit a request to the billing team using the following form:
https://invisioncommunity.com/contact-us
Just change the department to "Accounts and Billing".  

You might need to update the license status in your ACP as there is a good chance it has not caught up with your recent renewal.  
Try going to ACP > System > Settings > License Key
Click on the "Refresh License Data".  While you're there, make sure the info there matches what is in your Client Area.  
Once you've done, that, try the update again.  Also when you're starting the auto-updater, make sure you providing the username/password of your client area.  The auto-updater validates your client area credentials, not your ACP username/password.  (You're already logged in there.  haha)
If that does not work...  you could always just download the latest IPB files from your client area and upload them to your site.  Then just run domain.com/admin/upgrade.  When you do that...  it will ask for your ACP login!

Could you please confirm the user you are logged in as? I can then take a look for you

Feel free to PM it to be if you like, but what I mean is the user you are logging into your admin CP with when you get this error. You have a permissions error we need to look at for you, but dont know the user you are logged in as in order to check this

Hi @cualupe,
Just letting you know I have merged your topics for continuity.

It looks like a member of the IPS staff will need to help out then.  The good news is you can post in the official tech support forum now that you are in the active clients group instead of just the user-to-user help area.  
https://invisioncommunity.com/forums/forum/497-help-support/
I reported this topic earlier so the staff see it since many don't patrol this part of the site as closely as the official help forum, but now you can at least post there too! 😄 
 

All support is initiated through the forums here.  There is not email support offered for self-hosted license any longer.  (Staff can move issues to a private email ticket as needed.)
With that being said, the forum account you're posting is not showing as linked to an active customer account.   Your member group is "Members" instead of "Client".  So you might want to check your client area with the same credentials you're using here to make sure your license is current.  Licenses renew every 6 months for support and upgrades.  If you have an active license, a staff member will need to help get your account linked properly.