Some time ago I started investigation for a better differential update algorithm. The first attempt was known as time-travelling tdmupdate (also "tdmsync"). The second attempt has been much more cumbersome, but I think it has reached some usable state.   Here is the new tdm_installer: Windows (32-bit) Linux 64-bit Note that it is not a finished application yet: it has some important features missing, probably bugs also. If your TDM installation is important to y