Here is a page with a few things you should know about the randomizer: Before you start.
Download the latest stable installer version from here (Under Assets, download the .msi installer file).
If you want to build from source, follow the instructions here (Windows, Linux and Mac).
You can also use the web app hosted at z2r.app.
The tooltips in the randomizer cover a lot of the options. (You can find the equivalent tooltip information here.)
Here are some pages on topics that are more in-depth:
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