Upgrading 3.5.5 to 3.5.7 (or newest 3.5.x)

We have a few customers who are running Adobe FMS version 3.5.5, and got pinged by the security office because the version was less than 3.5.7.

"Plugin Name: Adobe Flash Media Server < 3.5.7 / 4.0.3 Denial of Service (APSB11-20)"

These are 32-bit Red Hat 5 systems, and I'm trying to find how to update the FMS install on these systems to pass this security check.

I haven't been able to find any installers for 3.5.7 on the Adobe site, nor any documentation on how to upgrade FMS (just run the installer?)

Any help anyone can provide would be greatly appreciated.

Thanks!