It's impossible to say if the application is compatible with Windows 10 or not due to the lack of information from the developer's website. I've accessed their page and searched for EPOS leads, but it appears that it's now a module embedded into a payment system listed on their website as well.
You might have to contact the developers of the application in order to find something about the EPOS availability and its system requirements: https://www.xigen.co.uk/contact/
