Norton is grumbling over the latest v4.1.1 installer. It is flagging up on one of its heuristic checks the installer's temporary file as suspicious and blocks by default.
These heuristic checks are often troublesome (sometimes useful though) so just a heads up as I've not had this with the RAM Disk setup before during upgrades. Maybe worth SoftPerfect reporting this as spurious assuming all is well with the current download.