I routinely update my WordPress Plugins and found when updating Wordfence I received the following error:
Installing Plugin: Wordfence Security 5.7.8
Downloading install package from https://downloads.wordpress.org/plugin/wordfence.5.7.8.zip…
Unpacking the package…
Could not copy file. wordfence/images/wordfenceFalcon.png
I tried a second time and received the same error for a different file.
Searching WordPress support forums I was able to find a solution that worked.
I SSH’d on to my server and located the /wp-content/upgrade/ folder for my WordPress install. Inside I found a folder called wordfence.tmp
I deleted this folder completely by running sudo rm -rf /wp-content/upgrade/wordfence.tmp
Once the file was deleted I was able to perform the upgrade as normal.