Ahmed Raza Khan: Mohammed Aqib Qadri:
And when the Book from Allah (the Holy Qur'an) came to them, which confirms the Book in their possession (the Taurat / Torah) - and before that they used to seek victory through the medium of this very Prophet (Mohammed - peace and blessings be upon him) over the disbelievers; so when the one whom they fully recognised (the Holy Prophet) came to them, they turned disbelievers - therefore Allah's curse is upon the disbelievers.
Yusuf Ali:
And when there comes to them a Book from Allah, confirming what
is with them,- although from of old they had prayed for victory against
those without Faith,- when there comes to them that which they (should)
have recognised, they refuse to believe in it but the curse of Allah is on
those without Faith.
Pickthal:
And when there cometh unto them a scripture from Allah,
confirming that in their possession - though before that they were asking
for a signal triumph over those who disbelieved - and when there cometh
unto them that which they know (to be the truth) they disbelieve therein.
The curse of Allah is on disbelievers.
Courtesy of: 
(PrayerWare)
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