Initially I was told no tickets purchased via points is not allowed to upgrade in month of august .Hey Ashish are you sure / things have changed now ? Just wanted to reconfirm before making a booking via points.
But after that I have done it thrice and it worked properly ,
Jus call customer support
Keep them on call
Book ur tickt online against points ,
Jus confirm with them before purchase will they upgrade ,
If they say yes , just share ur pnr
They will immidiately share with u payment link of diffrnc in tax which will be less than Rs.100 per ticket .