Unity 5.4 For Me… i did use Unity 4… but i didn’t how to do shit… so i never opened it since… lol
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The first Unity version I downloaded was around 3.5. But 4.0 was where I really got into Unity (Mecanim was pretty hot back then).
5 years later, and I am currently working on several projects (see my signature) using Unity 5.5.
Time sure flies fast! 
Unity 5.2 in the fall of 2015! I’ve been slowly getting the hang of things as precious time permitted ever since!
4.4? Can’t remember, to be honest I can’t remember pre Unity 5 days but I do the remember the first version of Cosmos using the old code based GUI system
Unity 3.0 is what I got started on.
Unity has come a long way since then.
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Unity 3.5. Would have started with it earlier but I didn’t discover it had gotten a free tier till then.
While I was around in the days of Unity 2, I didn’t really start using Unity until 2.6.1 to 3.0.0.
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I got Unity with version 5.1.
3.5ish seriously. I played with it on and off since the nearly the initial release but never built anything with it.
I believe it was 2.0.
The tropical island demo got me hooked 
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2.6 (I believe, whichever was the final one in the 2.x cycle) for me, way back in 2010. Still here 7 longs years later.
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4.x not sure which one, but it was before the new gui system since i used ngui back then., But unity was like my 3rd game engine i learned.
2.6
But only really started playing with it properly when 3 came out. I remember opening the 3rd person soldier sample scene and going wow, and clicking on all the things in the scene and seeing how they are put together, and had no freaking clue what I was looking at
Unity 5.5, oh I feel young now
I wanted to be a game developer, but almost gave up the idea because I don’t know C++ and I’m using a Linux desktop. But one day, I heard that Unity supports C#, which isn’t really that much different from the language I know, and is also available on Linux for free, so I was sold immediately.
Spring of 2009. I think it was Unity 2 if memory serves. I recall it cost something like $750 for Unity itself and $750 for the “iPhone” add on license. Those were heady days…
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And one of the only assets (before the Asset Store, if I remember correctly) was Sprite Manager 2, which cost something like $250. It was pretty facepalm for Unity, as during those days most of everyone was just making 2D games, but Unity didn’t release 2D features until 4.6. Strange that Unity was even successful, really. But Torque failed… and no one else was really appealing to hobbyists, so maybe that is why. No competition = swallow entire market even if you suck. Plus that mobile bubble…
Although we got free & reasonable paid assets just before then (late v3?), back in Unity 2.6/3.0 I remember people either forked over those hundreds or rolled their own 2D system. Soooo expensive… but well worth it bc of how much Unity itself lacked.
Sprite Manager 2 was a bit cheaper when bundled with the other asset, but I don’t remember what their other one was. I just remember the cartoon cow.
edit: Oh! It was EZ GUI. Can’t find the cow.
Yup I bought SpriteManager 2. Kids these days don’t know how good they have it
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4.something - making a pixel shader for android.
For me it was once it became available on windows, because it was only available on Mac otherwise.
Which version was out in 2008? That’s about when I picked it up. I did have to buy Sprite Manager, but that was before it got expensive. Think it was like $90?
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