Have you read the link I've sent? It explains exactly the reasons and answer your question
You can imagine that if we have hundreds of 3rd party scripts, each doing their own way to install, it means we'll have to de facto support them all, despite it's unrelated to Xen Orchestra itself. Which means spending resources instead of working on Xen Orchestra directly (or fixing XO bugs).
That's why it's preferable to open a ticket in the Github repo of the script creator, because that's exactly there you'll find the right answer, and also making sure the script creator could even fix their scripts if needed.
If you need community support in here, you have to install it by following the official documentation: https://docs.xen-orchestra.com/installation#from-the-sources
