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Indigo update won't install

Today I received an update notification for Indigo 2016 Vol. 2 (Update 2). After clicking the Download button and the Relaunch button I get the following error message:

"Indigo update couldn't be installed"

Then Indigo Studio will restart itself, and the update message to download the update is shown again. I can see that in the update folder there are 2 files:

Indigo Studio.tgz

How can I update Indigo Studio on my OSX El Capitan (10.11.6)?