Cant updat my macbook proV10.8.2 to V10.8.5

i Did try to download the V10.8.3 from the website as well. but unsuccesful. after download whn i start to install the update message come through (Invalid  checksum) i did download it more than 20 times but ...
Help Please Help.

Thanks Mate
i did download the file through recovery mode and run it through the standard mode but
also i did plug my MBP direct to the router after rebooting my router.
your advise is great i am in same track i do believe somthings is messing up with my files.
i dot have any issue with updating small files like itune and wifi updates but with last 2 big updates i was unable to install them (Invalid Checksum) which is an error regards to the corrupted file. i like to mention that the size of the downloaded file are the same as the original file.
im not sure if this issue can come through my ISP?
once again thanks

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