I understand you're looking for a legitimate way to obtain . Here’s a straightforward, factual path to get it legally and safely.
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. citrix gateway 21.9.1.2 download
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. I understand you're looking for a legitimate way to obtain