Another instance when I would like to run multiple instances is when I upgrade bitcoin. I will uncheck the generate coin check box in the outdated bitcoin, launch and start generating coins in the new bitcoin using a separate data directory, then when the old application’s coins have matured I will send them to the new application and then close the old application. I prefer do do clean installs rather than upgrading while maintaining old data.
Re: Linux build ready for testing (running multiple instances during upgrade)
Original Source
https://mmalmi.github.io/satoshi/Preserved as a quoted reply inside Satoshi's correspondence with Martti Malmi, published on GitHub in February 2024 as part of Malmi's COPA v. Wright testimony. The quoted reply header in Satoshi's mail records this as 'On Mon, Nov 9, 2009 at 8:59 AM, Liberty Standard'; the 8:59 is interpreted as US local time and converted to approximately 13:59 UTC.