I probably won't get around to looking at this issue until I've completed other features. Does creating a user account and password not work for you? For the SMB functionality you want, I'd need to add support for SMB1, which is against Microsoft's recommendations due to security concerns. I'm looking into adding DLNA. You can also use XBVR to set up a local http server. It works really well with HereSphere, since you get tags, thumbnails, and more features. Itch.io probably won't be able to issue a refund since your purchase was over 90 days ago. Sorry about that.
By the way, it seems like I wasn't getting notifications from itch.io about posts on this thread for some reason. Sorry about not responding earlier.
Edit: If creating a user account and password for your SMB share doesn't work, I can try looking into getting guest access to work on SMB2/3 again. There isn't a guarantee that SMB share enumeration will work. With my PC, share enumeration works ok. But with Macs, it doesn't seem to work. I'm not sure it'll work with your UNRAID server.
Edit #2: Ok, turns out guest access does work in HereSphere when accessing my Windows 10 PC. I just had to turn off password protected sharing in the advanced sharing settings in the network and sharing center, and then add either "Everyone" or "Guest" account access to the share folder. SMB share enumeration also works. I haven't used UNRAID before. Can you try inputting your share folder name into the input box on the second line in HereSphere to see if at least accessing the share directly works?
Can you also try adding "min protocol = SMB2" (without the quotes) in the WSD options [experimental] field in your UNRAID settings?