Andy Millne

You will need to enter the Maxmind User ID in the maxmind settings. You will see a notification in the admin control panel to set this up after the upgrade.
For PayPal you will need to update settings with client id and secret and there may also be some additional account verification steps on the PayPal side for payout permission if you are using that functionality.
There are no settings changes for Stripe.

Thank you, we have included a fix for this issue in the next beta.

ips4_acpTabs is a valid cookie and that is an allowed value. It seems your firewall is flagging a false positive.

There aren't any limits in Invision Community that would restrict this, no. It sounds like there might be a PHP variable such as post_max_size or max_input_vars. You should be able to check these in phpinfo or by checking with your host.

The next version of events has dedicated support for online events. When creating the event you can toggle between online and physical address.
 

You should be able to now

This should be fixed for the next release.

The Spam Defense Service passes the email address and IP address of the registering member to the service to determine the likelihood a registering account is a spam source.
How we use and store this data is described in the privacy policy at https://invisioncommunity.com/legal/privacy/

If the original untranslated string only has one %s then %2$s will not exist. You need to use %1$s for both times you want the replacement to occur.

The requirements checker has been updated to not prompt users of MariaDB to upgrade.

This should honour the value set in vBulletin. After conversion the value is stored in the core_members allow_admin_mails database column.

Please make sure you have enabled the support department setting to allow associated products.

I have submitted a change to make this more clear when enabling the Show submit support request button.

Thanks for reporting. This should now be resolved.

The custom font size is a generic page builder block setting and is intended for any body text. It sounds like in this situation it is the caption that is not being altered for you? If so you would need to specify custom css to override the value with an !important flag for the ipsWidget_imageCarousel__caption style.

The requirement for address has been removed in 4.6.7.
It is intended that PayPal is not available where a free trial is in use. This is not supported by PayPal for this API integration unfortunately.

The files should be removed immediately when the gallery item is permanently deleted (not soft deleted). There is also a task that runs that removes temporary files after 1 day. Temporary files can be stored if for example a user uploads an image and deletes it on the form without submitting or they abandon the upload process. 
If permanently deleting images/videos in your gallery is not immediately removing the files please let us know and we can investigate further via a ticket.

Downloads files are deleted immediately after the main file records are *permanently* deleted (not soft deleted). There are occasions where "unclaimed" files may remain however. For example, if you upload a file on the submission form and delete it or upload without submitting the form then these will be retained in case the user returns to submit later.
Those temporary files are deleted via a task after one day so if your tasks weren't running or you took your backup during that 1 day period then it would explain why you may have had some redundant files.
I hope that helps.