Enterprise customers who purchased TMG 2010 under a volume licensing agreement can still access the ISO via VLSC. Download permissions are tied to the original license agreement. Contact your organization’s Volume Licensing administrator.
: Some third-party "legacy update" sites host older Microsoft binaries, but these are unofficial and carry the risk of being bundled with malware. Visual Studio Subscriptions
Ensure .NET Framework 3.5 SP1 is installed via Server Manager before running setup.
Let’s be unequivocal: The product is end-of-life, has no security updates, and multiple unpatched remote code execution vulnerabilities exist.