I may be wrong, but it looks like, that the storage provider has changed his file handling policy.
There is no direct download possible.

wget produce the same message like pkg
wget https://pkg.ghostbsd.org/stable/FreeBSD:15:amd64/latest/meta
--2026-06-05 16:30:25-- https://pkg.ghostbsd.org/stable/FreeBSD:15:amd64/latest/meta
Auflösen des Hostnamens pkg.ghostbsd.org (pkg.ghostbsd.org)… 136.0.77.4
Verbindungsaufbau zu pkg.ghostbsd.org (pkg.ghostbsd.org)|136.0.77.4|:443 … verbunden.
HTTP-Anforderung gesendet, auf Antwort wird gewartet … 403 Forbidden
2026-06-05 16:30:25 FEHLER 403: Forbidden.