Open WindowsPhone.iss and edit like this:
[Redists]
;
Redist Caption|
Exec Directory +
File|
Arguments
Redist1=
Direct X 9.0c|
DirectX\DXSetup.exe|
/silent
Redist2=
Microsoft Visual C++ 2013 x86|
_CommonRedist\vcredist\2013\vcredist_x86.exe|
quiet /norestart
Hope it'll help
