I downloaded and installed Web Core 1.3.1.1. Immediately after installation and while still in Subscription Manager, the Install icon indicated Web Core was installed. The color bar was orange which is unusual for Web Core as it usually goes green after an install. I restarted Subscription Manager and it showed orange, red text in available and the install icon instead of the installed icon.
I uninstalled, deleted all folders, rebooted, disabled anti-virus, downloaded from product page, and installed manually. Text in available is in red and shows 1.3.1.1 12/14/2019. This is the same issue I was having that was corrected in XData 4.9.1.2.
Also, the XDataMusicWeb.web demo is not working.