Re: Sims 3 store update...

That's probably the Store Update Patch. 1.42 is the latest game patch.

It's downloading very fast cause it's only 2 MB in size. 

Can you check on the file size of your current store update patch. You'll find it in documents\electronicarts\thesims3\contentpatch.

Should be around 2 MB. If it's not, move the whole contentpatch folder to the desktop (close the launcher/game first) and then try redownloading ist.