Hello there. Anyone already tried to install the version 1.0 in Mojave on a Mac? After installing I cannot open it, I get the following message:
Help would be much appreciated! Thanks in advance! Best,
Ernesto
You need to right click on the Rack application icon in the Applications folder (or wherever you have placed it), then select Open.
You only need to do this once. After that, Rack will open as normal.
Please also see the FAQ in this post: An unofficial guide to the Rack v1 Changelog
And welcome! 
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Honestly, that wasn’t obvious! Should be in some kind of FAQ or some such when you download the 1.0 version. It was working for me before. The workaround and unofficial changelog aren’t discoverable.
It’s in the FAQ section at the top of the ‘Unofficial Guide’ linked from the bottom of the Rack 1.0 download page.