HT201364 Am trying to upgrade to mavericks from Lion 10.7 but whenever i press upgrade, i told that The server gave an error during download: 403 Forbidden.

Am trying to upgrade to mavericks from Lion 10.7 but whenever i press upgrade, am told that ``The server gave an error during download: 403 Forbidden``.
Below are my hardware specs. Does anyone have an answer to this?
Hardware Overview:
  Model Name:          Mac Pro
  Model Identifier:          MacPro4,1
  Processor Name:          Quad-Core Intel Xeon
  Processor Speed:          2.93 GHz
  Number of Processors:          2
  Total Number of Cores:          8
  L2 Cache (per Core):          256 KB
  L3 Cache (per Processor):          8 MB
  Memory:          9 GB
  Processor Interconnect Speed:          6.4 GT/s

http://www.apple.com/support/mac/app-store/contact/

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    com.apple.driver.AppleUSBTCKeyEventDriver     240.2
    com.apple.driver.AppleUSBTCKeyboard     240.2
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    com.apple.iokit.IOAHCIBlockStorage     2.4.0
    com.apple.driver.AppleUSBHub     650.4.4
    com.apple.driver.AppleSDXC     1.4.0
    com.apple.driver.AppleFWOHCI     4.9.9
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    com.apple.driver.AppleUSBEHCI     650.4.1
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    com.apple.nke.applicationfirewall     153
    com.apple.security.quarantine     3
    com.apple.driver.AppleIntelCPUPowerManagement     216.0.0
    com.apple.iokit.IOSurface     91
    com.apple.iokit.IOSerialFamily     10.0.7
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    com.apple.iokit.IOBluetoothHostControllerUSBTransport     4.2.0f6
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    com.apple.driver.AppleThunderboltEDMSink     1.2.1
    com.apple.driver.AppleThunderboltDPOutAdapter     2.5.0
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    com.apple.kext.triggers     1.0
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    com.apple.driver.AppleThunderboltDPAdapterFamily     2.5.0
    com.apple.driver.AppleThunderboltPCIDownAdapter     1.4.0
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    com.apple.driver.AppleUSBMergeNub     650.4.0
    com.apple.driver.AppleUSBComposite     650.4.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice     3.6.0
    com.apple.iokit.IOBDStorageFamily     1.7
    com.apple.iokit.IODVDStorageFamily     1.7.1
    com.apple.iokit.IOCDStorageFamily     1.7.1
    com.apple.iokit.IOAHCISerialATAPI     2.6.0
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    com.apple.iokit.IOUSBFamily     650.4.4
    com.apple.iokit.IOAHCIFamily     2.6.0
    com.apple.driver.AppleEFINVRAM     2.0
    com.apple.driver.AppleEFIRuntime     2.0
    com.apple.iokit.IOHIDFamily     2.0.0
    com.apple.iokit.IOSMBusFamily     1.1
    com.apple.security.sandbox     278.10
    com.apple.kext.AppleMatch     1.0.0d1
    com.apple.security.TMSafetyNet     7
    com.apple.driver.AppleKeyStore     2
    com.apple.driver.DiskImages     371.1
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    com.apple.iokit.IOReportFamily     21
    com.apple.driver.AppleFDEKeyStore     28.30
    com.apple.driver.AppleACPIPlatform     2.0
    com.apple.iokit.IOPCIFamily     2.8
    com.apple.iokit.IOACPIFamily     1.4
    com.apple.kec.corecrypto     1.0
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    Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x802C, 0x384A53463235363634485A2D314734443120
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    USB Device: BRCM2070 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: Apple Internal Keyboard / Trackpad
    USB Device: Hub
    USB Device: IR Receiver
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