Hi Amir,
The rules for the Marketplace App Install Button changed for Developer Accounts created after 5th March 2025. It is part of HubSpot’s new consistent 'App Install Flow"
The Install Button change was included in the Developer Changelog March 2025 Rollup
Here is the relevant section, best, Pete.
Updated app install flow in the app marketplace
We’ve updated the process for listing apps in the app marketplace to provide a unified experience for customers. These changes currently only affect developer accounts created after March 5th, 2025. Accounts and apps created prior to this date will still have the previous functionality for the listing process.
Apps in these accounts will no longer be able to set a custom URL for the app’s install button, and will instead select a redirect URL from the redirect URLs configured in the app settings.