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KWizCom Apps Foundation is a vendor-hosted app that includes shared utilities used by other KWizCom SharePoint apps.
If you are using a KWizCom app that requires the services of the KWizCom Apps Foundation, the app will display a message asking you to install the KWizCom Apps Foundationin your tenant.
Only a tenant admin can install it because it is installed in the tenant level. This is required only once, after that no matter to which site you add KWizCom apps, they will be able to use the tenant-level KWizCom Apps Foundation.