Downloading Mavericks (and any app), Error "Distribution file could not be verified"

When trying to download Mavericks (any app actually), an error comes up in the App Store, "The product distribution file could not be verified. It may be damaged or was not signed." I've tried clearing all caches and even starting in Safe Mode but nothing works.

This is what comes up in Console:

10/24/13 10:06:01.045 AM App Store[493]: *** Assertion failure in -[ISDistributionManager verifyDistributionAtURL:allowsDevSign:itemIdentifier:error:distributionControll er:], /SourceCache/Pisa/Pisa-135.34/ISDistributionManager.m:155

10/24/13 10:06:01.045 AM App Store[493]: FRPurchaseManager: Preflight operation for 675248567 failed with error: Error Domain=com.apple.appstore Code=0 "The product distribution file could not be verified. It may be damaged or was not signed." UserInfo=0x7fd2c0477c90 {NSUnderlyingError=0x7fd2c413cb10 "The requested URL was not found on this server.", NSLocalizedFailureReason=Cannot create PKProduct from "file://localhost/var/folders/yx/n_8mrp_50f1d8n5wr4yc2w1h0000gn/C/com.apple.app store/675248567/preflight.pfpkg" Error Domain=NSURLErrorDomain Code=-1100 "The requested URL was not found on this server." UserInfo=0x7fd2c4159310 {NSUnderlyingError=0x7fd2c0449d40 "The requested URL was not found on this server.", NSErrorFailingURLStringKey=file:///var/folders/yx/n_8mrp_50f1d8n5wr4yc2w1h0000g n/C/com.apple.appstore/675248567/preflight.pfpkg/index.sproduct, NSErrorFailingURLKey=file:///var/folders/yx/n_8mrp_50f1d8n5wr4yc2w1h0000gn/C/co m.apple.appstore/675248567/preflight.pfpkg/index.sproduct, NSLocalizedDescription=The requested URL was not found on this server.}, NSLocalizedDescription=The product distribution file could not be verified. It may be damaged or was not signed.}

I've done the whole, delete the folders in /var/folders/ but it hasn't worked. I've also reset the App Store through the debug menu. I've booted into Safe Mode, and still nothing. I've also tried to restore permissions on my drive and that didn't work. Any other ideas?