It's nowhere in the description but when you install it, you automatically get the idiotic 'extreme' version so you can't just simply play the original, normal Crusaders.
It's a scam.
..I.. GOG ..I..
They did, though, start the process back with Stronghold 2, and continued With Stronghold Crusader 2... However, in the "extreme" version, the only extreme thing is amount of cheating instead of strategy. The missions, starting with the first one, are set up in such a way that you have to pause-unpause to build even basic walls and units before the continuous waves of attacks start. AI, of course, has unlimited money and produces units at fascinating speed, To mitigate this, they devised a "clever" trick - a legitimate cheat menu where "superpowers" are available (from summoning units to "air strikes"), the only limiting factor being the scale which has to recharge before you use those superpowers again. So, instead of making the game strategically challenging, they introduce impossible setup, cheating AI, and cheat menu for players. Way to put the last nail in the coffin of any stragety and to the whole series. The only redeeming value is that we get to play original Crusader in HD, but that, of course, is "hidden" if you are not aware that the game installs all versions at once and only makes shortcut for "extreme" crap.
I booted uploaded into the campaigned and tried to beat the first mission on the easiest difficulty and this is unplayable trash! I get this is an old game but holy crap! First mission I spawn in with nothing and like 12 units, Meanwhile the enemy spawns with 50 plus a fortress and defensive towers! I had nowhere to build anything! Half of the things I tried to place I either couldn't or it didn't let me period! By the time I'd bought 12 troops for a total of 24 the enemy had over a hundred! I was so pissed and surprised at the speed I counted it's ridiculous! This is the worst strategy game I've ever seen in my entire life! I have never had bigger buyer's remorse so fast!
Tell me in an RTS what the heck am I supposed to do when I can't build, I can't collect recourses, I can't make troops and the enemy spawns with basically a 20 to 1 advantage! I wish I was kidding it's literally this bad this is in the top five for the worst ever games I've played in my life. Refunded almost Immediately STAY AWAY this is out of date useless trash. Play age of mythology instead this was bad when it released!