It seems that Maneesh has stopped maintaining the SBI rate. This was very useful but he must be facing some constraint! Thus one had to look for different sources and finally I found one which you may like to use.
This has been set up by Sahil Gupta and is also available on Github. The best way to go to this is via his blog
https://www.sahil-gupta.in/posts/historical-sbi-forex-rates/
He has links to an excel sheet that has this as well as pdf of the rate circulars since 1st April 2020.
This is one of the best I have found as the Github has a query by date which makes the job super easy. Have a look and let me know your thoughts. Kudos to Sahil. This is free but I think we need to encourage people like Sahil for putting this smart program and to continue to update it! I would suggest making a token payment.
Hope this helps all of you! If you have better options do share