Debugging Yootheme Pro (for Joomla) on a Windows environment

I've used Yootheme Pro page builder ( [login to view URL]) for Joomla to build a site for a client. I initially built the site on a Linux server and built some Yootheme Pro Custom Elements and all was working fine. ( instructions half way down the page for custom elements with the title: Adding a custom Builder Element, [login to view URL]). The client needs the site hosted on their IIS server. so I moved the site to their Windows IIS server and now the Custom Elements are not showing. I've taken a fresh install of Joomla and a fresh install of Yootheme Pro and tested with a simple custom element and it doesn't work on my local windows machine using WAMP. I did the same thing on my MAC and it works fine. There would seem to be a problem with the way Yootheme is written and being hosted in a windows environment, leading me to think that maybe it is something to do with how file paths are referenced in the VUE javascript files. But to be honest I'm not sure. I will need someone who can get the custom elements working on a window environment for me. You will either need to be running your own IIS server or WAMP (but better IIS as there is way the site will be). You will need a very good knowledge of Vue/PHP/json/Javascript/Joomla and how to debug. Understand of windows and IIS is going to help. I will need full information of the problem and how to fix. You will be able to replicate the problem with a fresh install of Joomla and I will send you Yootheme Pro and a test custom element. Full demonstration of the problem will be given over Skype and screen sharing. This should be a quick debug for someone who knows what they are doing. Many Thanks