How to reinstall Homeworld 2 classic

I accidentally deleted all of the files in the Homeworld 2 original directory, and I am wondering how you install it again without reinstalling the entire game.

Right click on game in steam, properties, local files, verify integrity of game cache. Should redownload any broken files, which I presume is going to include the ones you deleted.

Thanks and that sounds quick! :wink:
(Much quicker than the CD/DVD version)

Still instantly crashes after clicking on the option on the menu.