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Please refer to this documentation page: https://www.akeeba.com/documentation/akeeba-backup-joomla/update-dlid.html

Hello Harald,

The link I gave you is most definitely for Joomla 4. In any case, please follow the instructions below.

First, you need to find your download ID.

Download IDs come in two flavors, your main Download ID and Add-on Download IDs.

You can find your main Download ID in the My Subscriptions page of our site. We recommend using this Download ID only on your own site(s). This Download ID cannot be revoked, it can only be regenerated. If it's regenerated you will need to enter the new Download ID on all of your sites which can be a significant hassle.

You can generate an unlimited number of Add-on Download IDs without additional charge in the Add-on Download IDs page. Unlike the main Download ID you can revoke (disable) any Add-on Download ID at any time. As long as you only use one Add-on Download ID per site revoking or regenerating it will not affect the other sites' ability to download and install updates.

Then, you need to enter your download ID.

From the main administrator page of your site click on System on the sidebar.

Click on the Update Sites link towards the bottom of the middle column on the System page.

Find the Akeeba Backup for Joomla! package entry on the list and click on it to open the edit page.

Enter your main or Add-on Download ID in the Download Key area. Click on the Save & Close button on the toolbar to apply the Download ID.

If Akeeba Backup or Joomla! was already showing you that an update for Akeeba Backup is available you will need to install the update manually.

PS: The text above is copied and pasted verbatim from the documentation page I linked you to in my last reply except the two headers in bold type. In the documentation page these read "Finding your Download ID" and "Entering your Download ID" and they appear in the same order in the text. I would like to kindly remind you that I've written the documentation for all of our software myself. Furthermore, please do keep in mind that I cleaned up the Download Key feature for for-a-fee extensions in Joomla 4 (the original code for the feature was contributed as part of a Google Summer of Code internship by a student developer). Finally, I was the developer who had contributed to Joomla the support for for-a-fee extensions updates back in 2013, something the Download Key feature in Joomla 4 used as a foundation. You are talking to the one person in the world who knows better than anyone else how this core Joomla 4 feature works and has written the documentation for it :)