You can now unlock premium features for your current project by just inviting a minimum of 5 friends. The premium features will be available only for your current project and not across projects. And they will be available in that project forever. You can click on the 'UNLOCK PREMIUM FEATURES - FREE' button on the left panel in any project to invite friends.
You will see this modal when you are trying to export a video that is longer than the duration allocated to you or have added premium videos that you do not have access to or have exhausted your monthly premium videos quota.
Once you can click on 'Invite via Google' you will be asked to choose a Google account.
Provide the necessary permissions.
Select the friends you would love InVideo.
Click 'Invite' and enjoy premium features!