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Solution: wordpress Could not copy files issue on windows while upgrading

I was getting the error "could not copy files" on auto upgrade of wordpress from admin. As my system is windows 2003 based, I could not run those chmod 777 or other methods and the simple solution if you have the server access is to allow internet guest user access to the wordpress root folder, run the upgrade and then remove the internet guest user account.

Thats all there is to it, but yeah only if you have access to the server, otherwise you would have to work with your hosting provider.