@IPACS,
I realize this idea might cause more issues for you but I would ask you to consider dividing the SDK updates into exectutables+control files and data(textures). The total 600mb SDK takes about an hour for me to download and I would think that the executables (and maybe small control files) are usually the only thing that needs to be refreshed. The data doesn't usually change unless like for the repaints issue.
In any case, we all appreciate the SDK updates.
Dave