There are a few ways you can download Lark!
If you received an invitation to join Lark, the invitation should include a link or QR code that will take you to Lark's enrollment page. After successfully enrolling, you will be prompted to download Lark. Just follow the steps provided and you'll be well on your way!
If you already have a Lark account and need a fresh download, for example if you've recently upgraded to a new cell phone, you can download Lark directly from the relevant app store (App Store for Apple and Google Play for Android) and then sign in to your account.