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Ah, well, it's not that hard to find; just spend a few minutes searching. The problem is that it's not always easy to find a good version.
Okay, I'm feeling generous, so, as Gritsko would say, "Here you go!":
http://ufodefense.narod.ru/files/index.html
These are the best versions of the first two UFO games on the entire Russian-speaking internet, believe me.
And they're not 100+ MB each, but only 2.5 MB – as they should be. Plus, they're designed for Windows.
The only downside is that they sometimes crash, so save often.
You can reduce the scrolling speed by pressing "?" in tactical mode.
...
I haven't played the second game much before... today was my first Terror mission on a cruise liner :-(
I cleared the four levels outside more or less easily, but the hold...
Damn. There were even some broken stairs there.
And the Terror was probably not the easiest one.
The Tassots, for example, sometimes needed three shots from the sonic pistol. They were accompanied by a couple of weak Aquatoids and Triskins with bio-drones.
The Triskins are tough, have big teeth, and shoot a lot from the cannon on their back.
The bio-drones are nasty, accurate, and explode when they die. I once took one out, and it blew up half the deck on several floors at once :[
Now, in such situations, I poke them with a stasis rifle to make them fall.
...I decided to diversify my gameplay "in my own style." I gave some of them sonic and Gauss pistols in both hands. Clint Eastwoods, basically. I use the sonic pistol from a distance and at medium range, and the Gauss pistol up close – because it can fire in bursts.
One of my soldiers isn't wearing armor, but he's loaded with primed explosives. I use him to open doors when storming the UFOs. If an alien kills him with a reactive shot, the soldier will blow up the entire UFO, because the explosives will fall to the floor when he dies... and I don't care about the armor – because there's no universal armor, and the soldier is just an un-upgraded trainee. If he doesn't get killed, that's even better for me; the soldier will be reusable :D
I gave the most active one only vibro-blades – he rushes at the enemy like a Dark Eldar on stimulants and tears aliens to pieces in close combat.
And finally, to avoid overloading the soldiers with gear, I made one a supply guy – I put ammunition, grenades, medkits, etc., in his pockets and backpack. Now he runs behind his comrades and throws them new magazines across the battlefield...