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Which version did you download? if zip, then unzip and put it where you want. 
Installer -> well, install it through double click.

Game patch time depends on how much GB it has to download. Although don't keep S4S open if you are patching the game or it will try to update the fullbuild till infinity and beyond ! (simply close S4S during game patches and open it afterwards when it's done)

Oh boy I am getting rusty. Took me way too long to find this.

You shadow is the one at fault here.
It is too small. You made it 512/1024 instead of 1024/2048

Simply resize it and you can work on the rest (like, the normal map is not giving satisfying results and the channel you copied on the alpha is not the red one. For more info check this tut. Your specular needs to be reworked, the seams of the texture etc. But that's ok, you will learn plenty in the process :D)

To add to Anna here, I would say that more than the number of cuts it is probably that you mixed the numbers.

Usually on a bottom for example you have 3 cuts : 0, 1 and 2
The thing is that the parts numbered 0 and 1 work in coordination with their equivalent from boots as you can see on this picture:


That means that when a sim wears boots, the game check if the equivalent cuts exist as well on the bottom part and if yes, it will hide the cuts 0 or 1 or both depending on the boots or bottom so that the bottom fits properly with the boots. (and that you don't see trousers coming out of the boots for example). Of course it is a little bit more complex than that as meshes have often more than 3 groups but the idea behind is the same. the game checks for overlapping geometries and hides some.

All that to say that you need to check if you used to correct numbers on the proper parts. Like if you put the cut 1 on your dress and gave the number 2 on the part of the leg instead, then the dress would most likely disappear when wearing boots ^^

Edit : Actually after double checking on trousers they often have 4 cuts. But cuts 0,1 and 2 take the same amount of mesh space as cuts 0 and 1 on my picture. You mainly have an additional mesh part even lower at the very bottom. 

Hi vamprocillin
This is indeed a weight issue.
Your backpack simply has no weights assigned at all.
You can follow this tutorial to transfer weights from a reference mesh

Well, I first did it with 2.78, but like I played around on your mesh with the sculpting tool first I had to redo it xD
And when redoing it I opened 2.70 instead. It doesn't really matter for things like edge splitting.

MadeInOz
Unfortunately the mac version doesn't have the "my CC" function.
Best guess would be to hope for the creator name being written on the thumbnail in the game and see if the name is also on the package to then be able to open it and see what's wrong.
The white and red texture thingy is generally due to missing content in the package. (links to original mesh broken and such)

Once identified you could try simply checking the creator's webpage and redownload it check the required packages.