Since MP is disabled, this suggests a problem with your connection with Steam - even with a modified version, playing MP is normally possible.
And since your checksum is correct, yet you still don't get "validated". That, too, suggests there's something amiss with your connection to Steam.
While I'm not quite sure *what* would be wrong with your steam, can you verify that, just prior to starting EUIV (through steam), you show up as "online" in Steam?
And since your checksum is correct, yet you still don't get "validated". That, too, suggests there's something amiss with your connection to Steam.
While I'm not quite sure *what* would be wrong with your steam, can you verify that, just prior to starting EUIV (through steam), you show up as "online" in Steam?