It's not hard to add models once you know how, but even if he had the TL082 model, he would have to modify it if he wanted to see the results of worst case parameters. The learning curve for LTspice is pretty steep. It's a useful tool, but it's not something you can just install, and become immediately proficient, as Jeepster sort of implied.He wouldn't find the op amp he's using in LT's library; he would've used another device in the simulation, and still been in the same predicament with the offset voltage.
Unless of course he managed to figure out how to add the SPICE model for a TL082 into LTSpice's libraries.