I wrote to the address in the GPLv2 license notice and received the GPLv3 license https://lobste.rs/s/ifowil #historical #law
https://code.mendhak.com/gpl-v2-address-letter/
If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/lobsters/statuses/114394242685012209 on your instance and quote it. (Note that quoting is not supported in Mastodon.)