Plants vs. Zombies Garden Warfare won't download

Try closing Origin completely.

Run Origin as Administrator.

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Try a Clean Boot

http://support.microsoft.com/kb/929135

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Tempoariliy disable any AntiVirus // Firewalls.  Windows firewall is fine.

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Reset Host file

http://support.microsoft.com/kb/972034

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Flush DNS cache

https://www.whatsmydns.net/flush-dns.html

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Clear Origin Cache   :: Origin must be closed fully

Delete the Hidden Origin folders:

-- Origin folder in C:\ProgramData\

-- Origin folder in C:\Users\<USER>\AppData\Local\

-- Origin folder in C:\Users\ <USER> \AppData\Roaming\

Alternatively:

Uninstall Origin, reinstall Origin.  This does not uninstall games that are already installed, only Origin.