Can someone direct me to old KSP versions?

[Glitchgamer12]

I remember there was a post with old KSP versions in it for free download, can some one direct me to it?

[eddiew]

It's the third pinned post on this forum, entitled "The Earliest Versions of Kerbal Space Program"  

They are very old though... I wouldn't recommend them anymore, tbh, since so many improvements have been made.

[Geonovast]

I'm probably a little spoiled, since I started with 1.3.  I found the original games unplayable.  However, I know I would have loved them as much as I love 1.3 had I started back them.

[Snark]

On 9/5/2017 at 2:12 AM, eddiew said:

It's the third pinned post on this forum, entitled "The Earliest Versions of Kerbal Space Program"  

And just for posterity, in case it ever gets unpinned or moved for some reason:

 

[Kerbal pancake]

If you have it on steam you can go to betas and some of the previous versions are there 1.05 to 1.3 are there I think

[wumpus]

I doubt you would find the differences between most editions interesting, but here is what is out there:

1.0.0->1.3 pretty current (although I'm sure the language pack is huge for those who want it).  I'd expect that much of the newer editions mainly fix real problems.
beta (presumably on steam, I don't remember seeing the option): pretty much the height of the "old KSP".  Anything you could do before this is likely possible in this edition.  It has the "old aero model" which means that pancake shaped rockets typically work better than rocket shaped rockets.  Optimal TWR=2 for most of the souposphere (go straight up for 10km, turn 45 degrees East, burn till ap>70km.  Circularize at/before ap.
original demo (and before, these should be available in the above links): extremely primitive, expect to learn a lot about asparagus staging and using cans 'o boom.  Same souposphere.
 

Note that trying to match a mod to an ancient version might not be worth the time and you will likely be stuck with stock (and possibly digging through a "must have" mod or two).