I'm sure looking to figure it out, I've been experimenting in my free time. I hope someone figures it out. I'd really like to run XG Home on my SG115.
I have UTM 9 Free version running on my SG115 and it runs great and I don't have a big desktop sitting in a corner.
First you need to delete all partitions (you can do it with Acronis DiskDirector or MiniTool Partition Software). After this I installed the software ISO with a USB CD-ROM, not a special thing.