With the disapperance for myigel.biz it is not possible easily to download the ICG installer directly on the Linux server with wget anymore (I prefer to use the manual update over SSH instead of the update function in the UMS console). Maybe there is a way to request a personalized link on the IGEL website instead of directly downloading the file after accepting the EULA etc. The link can be valid for only a short time maybe 2-3 hours.
Similar too: https://igel.nolt.io/15
Will get removed since the new ServiceHub will allow downloads without Auth.