How to fix: PCLZIP_ERR_MISSING_FILE (-4) : Missing archive file ‘C:\Windows\TEMP/{whatever..}.tmp’

I’ve got the Windows server blues… This solution is based on this WordPress.org thread. PROBLEM When you try to update WordPress or install plugins, the downloader / installer page pops up, the compressed file is downloaded to your server, but installation fails because of this error: PCLZIP_ERR_MISSING_FILE (-4) : Missing archive file ‘C:\Windows\TEMP/{whatever you were …