You will find the release notes for the IGEL Universal Management Suite 6.01.100 both as a text file in the same folder as the installation programs on our download server and in this Knowledge Base article: Notes for Release 6.01.100.

To ensure that each UMS installation is always uniquely identified in the new IGEL License Portal, a UMS Licensing ID is created for each installation from version UMS 6.1 onwards. This can be configured in the UMS Administration > Global Configuration > Licenses > UMS Licensing ID and in the IGEL UMS Administrator: UMS Licensing ID Backup.