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I dont know about your case.. but i had the same issue before installation so what i did was went to C:\ProgramData\Battle.net\Client\.agent.db and opened in notepad and changed http://****.patch.battle.net:1119/patch to http://enUS.patch.battle.net:1119/patch then it worked. The installation ran.
**** is your client version. (like below) enGB enSG esES deDE frFR itIT plPL zhTW koKR esMX ptBR
I dont know about your case.. but i had the same issue before installation so what i did was went to C:\ProgramData\Battle.net\Client\.agent.db and opened in notepad and changed http://****.patch.battle.net:1119/patch to http://enUS.patch.battle.net:1119/patch
then it worked. The installation ran.
**** is your client version. (like below)
enGB
enSG
esES
deDE
frFR
itIT
plPL
zhTW
koKR
esMX
ptBR
Also you may follow this if above doesn't work..
http://us.battle.net/d3/en/forum/topic/5152415037?page=1