This is kind of a niche case involving legacy systems. We're using NSIS 3.03 to install our software. We have a SHA2 signed driver, but are aware some people are installing in older versions of Windows (7, Server 2008), which got the update for SHA2 support later. The driver (and our software) won't run on these machines, and we would like to avoid the installation all together if we can. How can we force a check for SHA2 compatibility before installation?