Download the package for your SharePoint Online tenant, then follow the installation guide to deploy it. A free 30-day trial or subscription is required for the app to work, so start your trial first if you haven't already.
Version 1.0.0.1. A valid subscription is required for the app to work once installed.
Vike Forms package
Installation guide
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The full guide has screenshots and details. This is the short version.
Download the latest package from this page, upload it to the App Catalog, and choose to replace the existing version.
To delete the data the app stores on a site, use Remove app data on the App Settings page before removing the app. See the guide for details.