Thank you, I was able to login and see what you mean with the extraction of files failing with an error.
As you are significantly behind in updates, I think upgrading manually may be the best bet here rather than using the automatic upgrader. As mentioned here in this guide, this would entail downloading the files from our Client Area, extracting them to your local computer, and uploading the contents of the "ips_****" folder to your server, overwring what is there. Then you will want to go to {your site's base URL}/admin/upgrade in a browser.
The automatic upgrader is fantastic for point upgrades but significant gaps in upgrades, like going 4.4 to 4.7 is best to do so manually when you encounter errors like this.
Please let us know how it goes π .