I had the same problem but this is what I found (your issue may be different): the 4.7.1.0 patch was adding an extra "Company of Heroes Relaunch" folder to the end of the directory installation. So for me it looked like "P:\Steam\steamapps\common\Company of Heroes Relaunch\Company of Heroes Relaunch" I deleted the extra folder and the patch installed correctly.
VonDeath
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