Error code U44M1P7 is obviously a catchall for any of several possibilities. The suggestion to manually download the update is useless. It isn't available. (A bad link leads to Mac version.) As for the other possibility, many other users and I have deleted the unneeded language files either by use of a cleanup utility or manually, on purpose. Any installer that has unspecific error codes, while not allowing for a sensible change that economizes space needs to be rewritten. An awful lot is riding on the integrity of the Adobe Download Manager, and its occasional failures are maddening. I run CC and CS6 Creative Suites, and I need to keep them both because CC has 'broken' so many plugins.
It would be very helpful to know where ADM puts downloaded files and have an option to save them before installing. It took me two runthroughs to get CC installed and I've tried for the CS6 update four times so far with no copy of the installer to reuse. At its best, ADM is lethargic to respond, and there remains the statistical near-certainty that the site will be down when someone needs to use it. Personally, I think the 'Cloud' is a lousy paradigm. I know I'm not the only one who looks back fondly on the days of physical media, or at very least downloads that could be burned to physical media. The whole cloud thing is still in its infancy, and a lot of user time iwasted while Adobe learns (and invents) the ropes. Maybe one day, when there is a 100% installed base of high speed fiber optic connections, the cloud will make our lives easier. It certainly hasn't done so yet.