I am new to appian and don't know what should be installed for appian designer. Tried searching a lot but didn't find anything useful. Tried opening a URL for installing appian designer but that URL didn't work either and showed an error message.
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You can also learn more about Free Trial resources and free online training by logging-in to academy.appian.com. If you'd like to learn how to become an Appian Developer, you should enroll in the Appian Developer learning path.
There is also a training video I saw on youtube that might help. You could go to youtube and search for Appian training to take a look.