Two weeks ago I encountered this problem, the patch download correctly but it won't install, I tried everything I could think of and was never able to fix it, so I reinstalled entirely path of exile and was fine until today, when the same thing happened once again.
All my games are installed on the same SSD, I have other steam games as well and they are patching properly, this happens only with PoE (so far) and because GGG unbelievable choice of having a single data file for the whole game, it is a big issue especially since I have a slow inet connection ; I can't re-install the game everyday after a patch...
I have the same setup since at least the beginning of essence league, i didn't change anything on my computer, my windows 10 user account has admin rights.
The only detail I could think of is that I am using a symbolic link between the steam download directory and another drive, because the game SSD is kinda full and sometimes games like PoE need 13GB of free space just to patch 20MB, but I have been doing that for years now and never encountered any issue.

Last bumped on Apr 28, 2017, 4:09:33 PM

Posted by
Ldle
on Nov 19, 2016, 3:02:23 PM

Had the same issue as you mentioned content file locked in file c:/blablabla what fixed the issue for me was freeing up enough space on my small ssd to get above 10 Gigabyte free space after that the install was done within a second. It's not an path of exile error but an very inefficient steam updater requiring to have 10+ GB free in any situation even if the file is only a few megabyte.

Posted by
randar1969
on Apr 28, 2017, 6:38:21 AM

1.) Make sure PoE is completely closed. Check the task manager to make sure the client is not running.
2.) Make sure your user has administrator rights.
3.) Perform all Windows updates.

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Posted by
on Apr 28, 2017, 4:09:33 PM