hey mate, i had the same problem as you did for a while, i usually right clicked the shortcut to neosteam and clicked "open file location" which will go straight to the neosteam folder, open the main executable of neosteam (or right click it and choose run as administrator) which should get you into the game, but the extra details and stuff the patchs give wont be there and the game will be a little buggier. goto the forums / send in a email to them and they should respond with a link. (imo ask GM. nana)
but tbh, neosteam isnt worth it until higher lvls as grinding is extreme