Trove Early Access
In order to get instant / guaranteed access to Trove, you must support the game or wait for an opportunity such as random invites or giveaways.
To get random invites via email, you need to sign up at the official Trove website.
Once you have signed up, you are eligible for being invited to be a tester by a "wave".
A wave is when Trove game access codes are sent out to random users without game access through email.
Waves are released whenever the Trion developers feel the need to.
Another way to get access to the most recent version of Trove is to get a code in a giveaway.
Most of the giveaways so far have been given out at Trove's Subreddit.
The easiest way to obtain early access to Trove is through buying supporter packs. See more details at the Support Trove page.