NseEIFO - New Version -Downloader For NSE End of Data and Update to Amibroker

Followed steps as in help file. While starting excel prog giving error "There was a problem sending the command to the program."
Using windows 7. Tried in win 7 home prem and win 7 ultimate.
pl help
Amibroker is giving error as C:\programfiles\Amibroker\NseEquity\watchlists\index.txt cannot be open for writing.

Earlier problem of sending the commmand to program is resolved.
pl chek and verify