Citrix Gateway is not sold separately anymore — it’s the VPN / access component of Citrix ADC. Version 21.9.1.2 corresponds to ADC firmware 13.1‑21.9.1.2 . Citrix no longer hosts older patch releases publicly; only the latest maintenance builds of each major release are kept on their download portal.
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You cannot directly download 21.9.1.2 as a standalone Gateway installer from Citrix’s public website today. That specific version is part of the Citrix ADC (formerly NetScaler) release 13.1 build tree. Citrix Gateway is not sold separately anymore —