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I'd recommend following the instructions in https://www.akeeba.com/documentation/akeeba-backup-joomla/installation-updates-upgrades.html#installation-troubleshoot under “Checking your temporary directory”.

Please provide me with the following information:

1. The URL to your site's administrator login page
2. Super User username and password
3. FTP connection information

Please allow up to one business day (GMT+2 timezone) for me to log in to your site and debug this issue. When I'm done I will post back. Once the issue is fixed, you can revoke my access e.g. by changing the Super Administrator and FTP passwords.

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----- Access Information Form -- START -----
Super Administrator access

• URL to site's administrator page (e.g. http://www.example.com/administrator?foobar):
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FTP connection information

• FTP methods supported (e.g. FTP, FTPS, SFTP):
• FTP Hostname:
• FTP Username:
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----- Access Information Form -- END -----

Please make sure that you have tested the Super Administrator connection using a different browser or machine than the one you are using daily. Double check that logging in is possible and that the user has Super User privileges, i.e. it's not a regular Administrator. Make sure that your site does not block whole countries or IP ranges which would make it impossible for me to log in / connect by FTP. Finally, please do make sure that the FTP connection works and that logging in to it I have access to your site's files.

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I can now see what the problem is: ownership and permissions hell.

All your files and folders are owned by the user ID 10050 which is not the same as the user your site runs under (froufrou).

Since the tmp folder was actually unwritable you would get the error about a missing XML file exactly because Joomla could not create a temporary directory to extract the files. I gave that folder 0777 permissions and we went past that.

Now Joomla complains that the installation path cannot be found because the components, administrator/components, etc folders are not writeable.

To make matters more complicated, Joomla's System Information says that the folders are writeable but I actually did check and PHP cannot write to them.

I could give all these folders 0777 permissions but this is like detonating a ton of TNT to kill a mosquito. I'd rather you asked your host to change the ownership of all files and folders (recursively) under your site to your user (froufrou). You should then be able to install extensions.

You're welcome!