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[Descan]

If you do currently use steam, I wonder if you could get hold of a steam key for KSP. That would solve your future problems, but it wouldn't solve the "I don't want to go over my data limit!" unless putting your copy of KSP into the folder steam creates when you go to download it, would make steam go "Oh. Hey. You already have this. Alright, cool, I'll just patch you up!" Maybe if you did that and told it to verify the integrity of the steam cache or whatever it's called?

Here:

Q. Does everybody get a Steam Key?
A. No, only customers who bought the game before it was available on Steam, the deadline is March 20th 2013 at 1:00 pm GMT -6:00

If you qualify, then see the below.

Q. How do I go about Transferring my copy of KSP to Steam?
A. You’ll need to log into your store profile page, scroll down to where your profile shows the option to download KSP and click on “Optional Steam Transfer”

[BigD145]

Once you transfer to Steam, that's it. There is no going back. Sometimes Steam games just download everything, not just what changes in a patch.

Looking through the zip from the ksp site, most of the data has been changed/recompiled. The timestamps on a good 400+MB's of files are for May 1st.

[Putnam]

Yeah, that does happen sometimes. KSP has zero DRM on steam, though, so that's also nice (you can just copy+paste it to elsewhere on the computer, uninstall steam and still play it)

[Skyrunner]

I'm not sure if I suck or not, but I'm actually having trouble making a ship to go to the Mun and land and return. I need maybe 1.5k more dV but I just can't manage to fit that onto my ship :x My techs are all undrr-90 science ones except the fuel line one.

I can do flybys of the moon though!

[TheDarkStar]

Which VAB do you have?

[Skyrunner]

255 part.

[Karlito]

I'm not sure if I suck or not, but I'm actually having trouble making a ship to go to the Mun and land and return. I need maybe 1.5k more dV but I just can't manage to fit that onto my ship :x My techs are all undrr-90 science ones except the fuel line one.

I can do flybys of the moon though!

I had most of the next tier parts before I did a land-return from the Mun. I got enough science with Mun and Minimus flybys, as well as landing some unmanned probes on either body.

[Rakonas]

Seriously why does my ship even with SAS on suddenly become oriented towards retrograde and with massive pendulum swings around where I can't re-orient anything and die terribly?

[TheDarkStar]

Seriously why does my ship even with SAS on suddenly become oriented towards retrograde and with massive pendulum swings around where I can't re-orient anything and die terribly?

It's the atmosphere.

[Putnam]

Seriously why does my ship even with SAS on suddenly become oriented towards retrograde and with massive pendulum swings around where I can't re-orient anything and die terribly?

you're gravity turning horribly wrongly

[BigD145]

Seriously why does my ship even with SAS on suddenly become oriented towards retrograde and with massive pendulum swings around where I can't re-orient anything and die terribly?

SAS is magic, but not that magic.

[Sean Mirrsen]

Your ship becomes lighter in the nose than it is in the back, and atmospheric drags flips it around if you're going too fast. Go slower, or add fins to the bottom.

[MarcAFK]

This is probably off a bit but think of your ship as being like an arrow, it will want to orient itself so that the heavy part is at the front, and the part with highest drag is at the end. While an arrow has the desirable property of being designed in this way already which makes it stable, a rocket by design will start to become light at the nose, drag at the nose end will try to orient that to the back, the greater weight of the back will try to orient that towards the front.
Theres not much you can do to prevent the weight shifting, other than adding another stage or finding some way of delaying the buildup of empty tanks near the higher end of the rocket, however you can increase the drag of the back end with fins, or reduce the drag of the front end by reducing speed in the atmosphere. Going too slow however does cause some instability since theres a certain stability in maintaining a stable ballistic enertia. At least I noticed this when launching rockets with an unstabilised probe core.

[Shadowlord]

I don't know what happened in 1.0.1 or 1.0.2 to cause this, but the same rocket that made it into orbit just fine yesterday (with 0.16 mass added, in 16 basic fins, to stop it from flipping over, because apparently flipping is even more likely now), is no longer able to even get above 17 km and is behaving as though it is massively heavier:

The solid rockets accelerate it about 40% as well as in 1.0, and then when the second stage activates it can't stop the velocity from dropping, as though it no longer had a TWR above 1. The masses don't look any different, though... The thrust on the engines looks the same too...

(Whether it flies straight up, or flies at a 45 degree angle seems to make no difference. It falls out of the sky either way.)

[Dorsidwarf]

Weird - I've had the exact opposite problem, and all my rockets which were finely calibrated are soaring so fast so early that they literally explode