"Spectersync Core required"

This message means the official Specter app is trying to sync with your CMS, and the paid app requires an active Spectersync Core subscription.

Spectersync Core is no longer sold to new customers. If you already have a subscription, make sure it’s still active under Settings → License — existing subscriptions keep syncing and keep getting updates. If you don’t have one, use the free open-source project on GitHub, which has no license gate, or get started free in the hosted webapp.