Is it necessary to update patch 2.1?

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Is it necessary to update patch 2.1?

After I updated to 2.1, the game stopped working and I tried any fix given by Tommy but still no luck.
Fortunately, I have retail version so I just uninstalled and reinstalled it to 2.0 and play.
But I have one question is it necessary to update patch 2.1?
Any bug fix or improvement?

Sorry for my bad English......
 
No the 2.1 patch does not have to be installed . The 2.1 supposedly fixed some minor game improvements and updated the posting Arena scores functionality but nothing major .
 
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