I redownloaded part 8 but im still receiving the errors

when i try to extract the game the TW2AoKEEK.part08 gives the following error :
Checksum error in The.Witcher.2.Assasins.of.kings.Enchanced.edition-KaOs\kas-tw2aokee.r45. the file is corrupt.
Checksum error in The.Witcher.2.Assasins.of.kings.Enchanced.edition-KaOs\kas-tw2aokee.r47. the file is ...

I recently downloaded the Witcher but when I start it it give me a black screen for about 2 second then it closes.. In order to work I disabled the gpu then it start but when I enable it again it closes.. Please help me I cannot play it WITH My gpu disabled because there is low fps like 0.5 when it ...

It worked Thanks for all your help..... You are really The King!!!

The link is:https://mega.nz/#!bgJwlTRY!6ZeCHAMfDBOA ... k2Q_601HFo

But if it is possible you can upload for me only.. Kas-se3f.r.15 because in the archive that is the only file which is corrupted

When I try to extract it and it reach part 2 it says:checksum error in the encrypted file sniper. Elite. 3.Final-KaOs\kas-se3f.r.15. Corrupt file or wrong password... I have tried to re-download it but this error keeps showing up. .. Please help me