Jim M

Is your custom language pack compatible with the release you're on? 

You have both a .htaccess and user.ini with the same details. You may wish to consolidate this into 1. Ask your hosting provider if you are unsure.
The error being displayed here is from your server and it is not making it far enough for our software's error logging to obtain what is happening. Unfortunately, looking at the few basic items which may cause a 500 Internal Server Error, I am not seeing anything evident. In order to further troubleshoot this issue, we really need the Server Error log entry for this error. 

You would need to revert your modified email templates in ACP -> Customization -> Appearance -> Emails

I have transferred this to a ticket but for future claims, you can utilize the Client Area as you are Cloud user and hosting items like this can be done via the ticket system there.

Sorry, there is no method to disable cache on blocks. It must be more than 1 minute.

Like Randy said, we do not provide FTP access on our Cloud. Only our software is allowed on our Cloud and everything in our software is managed through the ACP 🙂 .

Please ensure that all your login methods are set to email address. What you are stating here would indicate that you haven't done this and one is set to display name still. 

Please try clearing your browser's cache and local storage. Sounds like something got messed up a tad. The feature is supposed to save what you're typing but remove it from your browser's local storage upon hitting submit.

Sorry, we would not have any old sites of yours. The Account -> My Attachments are files which you uploaded here on our community, such as screenshots in topics here, etc... They would not be backups of your communities.
We do not manage backups for self-hosted communities. We do manage backups for our Cloud communities but you would need to submit a support request to obtain those, there is no automated process.

There would be no way to just say field "has data". There would need to be some value there.

Unfortunately, this is an issue with your custom theme, please create a new theme by going to ACP -> Customization -> Themes -> Create New and then set that as your default theme. You will then see your login fields are back. 

I'm afraid, only the default browser on the device is currently supported. For Android, this would be Chrome. I would suggest using Chrome and letting us know if you still have issues.

Sorry, we only provide the latest release. However, I am a little confused on why you would need 4.7.3 as it sounds like you want to upgrade to PHP 8, is that correct? If so, you can just switch to PHP 8 and perform a manual upgrade.
Here's information about doing a manual upgrade: 
 

This is a partial query it appears. Is that the full log?
 
That would likely indicate that there is an error in a custom or third party application/plugin/theme. You would want to disable those and then switch an unmodified theme to test.

If this happens in the future or anyone else needs info, you can enable recovery mode as detailed in the following guide
 

I have just responded to the email we received a few minutes ago from you. Sorry, I'm afraid, this was the only email on your account. However, please see the email and we can help you get your account cancelled.

This is the Edge browser, I'm afraid, not our software 😉 .
Can click ctrl+shift+v to paste the URL itself.

We have assisted you in the account email you submitted.

It's in the language system: 
 

Once you use any menu item, it is not present to be used again. You would need to use the "External Link" option to do what you want to here.
If you would like to see changes to this in the future, please leave your suggestion in our Feature Suggestion forum.

This is called the "Topic Summary" you can adjust settings or disable it in ACP -> Community -> Forums -> Settings

The software would need to live in the same folder so whatever you want to name that folder which makes sense for your usage you can do.
It looks like you do have something at your root domain so you would not be able to put the software there unless you were to remove that.

I would recommend reverting any changes you've done in this area as it seems to be the root of your problem.

This is a known issue; a manual upgrade is required as mentioned here:
 

Thanks! This is a known issue which will be fixed in a upcoming release. To get past it now, you can perform a manual upgrade.