HTO is a mini-mod which redesigns the trading system in Stalker as well as other gameplay elements related to looting and selling items. HTO 2.0 is an expansion expected to be released at a future date. If I abandon this mod I will not fail to let the community know first! So hang in there.
This is version 1.3, it was my original concept for Hal's Traders Back in August 2012, if you are a first timer and don't want a significant challenge then this may be the version for you, though I strongly recommend either the Pure Edition or better yet, the new Master edition coming April 2013.