CashAddress: How do I convert a batch (1,000+) of old style addresses to the Cashaddress format?

Years ago I created many addresses by downloading the bitaddress.org webpage and creating the addresses on an offline computer.

I've had no problem, until today, when using one of the old addresses, when Gemini decides they do not like my old address format. Is there a bitaddress.org like (downloadable) so I can convert a batch of address to the new format?

submitted by /u/PilgramDouglas
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source https://www.reddit.com/r/btc/comments/a6gqlv/cashaddress_how_do_i_convert_a_batch_1000_of_old/