If you've paid your Advance Tax, for example through SBI, and forgot to download the challan, don't worry. You can often reprint it directly from your SBI online banking portal under the 'E-tax > Reprint Challan' option. Alternatively, check your Form 26AS after a few days for payment details, or try the bank's website if you used internet banking.
14 June 2020
You may wait for 4 days after having paid the challan and then check your Form 26AS there you will find the details. Also you may get the challan from bank's site if paid via internet banking. If paid using Debit card you may not be able to get the challan through bank's site.