Ariv is currently in beta, therefore only workspace owners or administrators can install Ariv. If you are not the workspace owner or do not have administrative privileges for the workspace please ask your workspace owner or administrator to install the app on your behalf.
If you got this message when you clicked on the Ariv installation link that was sent to you, then it is very likely that the workspace that you were trying to install ariv on restricts who can install what kind of apps. The only way to install Ariv in such a case, is to ask the workspace administrator or owner to install it for you.
If you see this message;
This usually means that the workspace that you want to use Ariv in, has a stricter app install policy and only workspace owners can install apps that are not listed on the Slack App Directory. Since Ariv is still in Beta, it is not listed on the Slack App Directory and that leaves you with only one option, ask the workspace owner to install Ariv, using the same link that was sent to you, for you.
Go to the Settings & administration page for your workspace, and under administration select Manage Apps and if you see the following screen you have the requisite permissions in Slack to install and manage apps.
If the Require App Approval toggle is turned off - then any member of your slack workspace will be able to install apps. Incase its turned on you will have a more granular permission structure for installing apps as shown above 👆