Hi, I have ESS installed on my current PC and have just purchased a new PC. I was looking to buy a license for the new PC but I noticed there is a decent discount for buying two licenses at the same time. My current license does not run out until February of next year. Q1 Would my only option be to buy two licenses now and use them on both machines, that way keeping both installs in sync? (I would be losing out on a few months of my current subscription but availing of the discount next year) Q2 Does it matter which version of the ESS client I use on the machines? My new PC is Vista 64bit and my current PC is XP SP3, I'm assuming that once I have the license I can apply it to whatever version of ESS I'm running. Q3 Related to the above. I see there is both version 3 and 4 of the product, is it better to be using version 4 or is it still a trial product?