Blog Post
Hi there JodieB2015,
We are sorry to hear about the predicament you're in. It is not unusual for companies to decide to retire older operating systems to better utilize and delegate their resources into more recent and advanced products; following Micrsoft's announcement on ceasing support for Windows XP, it was inevitable that AccountRight would eventually become incompatible with Windows XP as well, as the software does utilize a lot of Microsoft components in order to function properly.
In regards to your question, technically, you are able to reinstall v2014.4 on the computer that you had initially run the update on. However, if you have already upgraded your company file for use with v2015.1, you will have to restore the latest back up made in v2014.4 to use from here onwards, as the program will not allow you to use the upgraded file in an older version.
Again, we do apologize for the inconvenience this has caused, and please do keep us updated with how you go.