iDash installation is on D drive.
I had to explicitly create a shortname PROGRA~1 for "Program Files".
You can do this with following command
mklink /J "D:\PROGRA~1" "D:\Program Files
1. uninstall iDash
2. enable fsutil and create shortname
D:\fsutil file setshortname "Program Files" PROGRA~1
3. install iDash