If you are looking for a way to play the game today, the most reliable method is through a digital store like GOG.com , which sells the edition (including the Spearhead and Breakthrough expansions). Digital versions from GOG.com are pre-activated and do not require a manual CD serial number for installation.
: Detailed technical information for running the game on modern hardware, including widescreen support and configuration tweaks, is available on PCGamingWiki .