Hi,
this happens sometimes for unknown reasons. Some people reported that starting the Starter as admin helped them.
There is always the manual install option though: You can download the latest build from files.star-made.org/build/
extract the zip to a folder named \"StarMade\" which has to be in the same folder as you put the Starter in (e.g. so if you have the starter in c:\\users\\me\\games, extract the zip to c:\\users\\me\\games\\StarMade)
after that the program should find the installation next time you start the launcher.
I hope i was able to help,
cheers,
schema