Upgrading from 1.1.1

[amit-nz]

I've got a very old pier machine running, but I want to upgrade it to the latest version now. The underlying OS is Debian 11 bullseye.

I was reading through these instructions, it seems pretty straightforward -
https://www.mailpiler.org/upgrade-instructions/

Except, where do I find the package to upgrade to 1.2.0? The oldest package available on github releases is v1.4.5

Ideally I'd love to migrate to docker, but I'm guessing at the very least I will need to go from my current ver (1.1.1) to 1.2.0 -> 1.3.0 -> 1.3.5 -> 1.4.5 - and then to 1.4.6 and beyond via docker.

Or is there another upgrade pathway I can use?

TIA!

[jsuto]

Well, no need for such sequential upgrade, you can go from 1.1.1 to 1.4.8. The process is straightforward, but may not be easy, as you need to apply a series of database changes, and the upgrade the app (binaries + web app). Not sure if an export + import is viable approach for you, depending on the volume of archived emails, especially if you want to move to docker, it might be simpler. Anyway, be sure to have a backup before the upgrade, just in case. Also it's a good idea to perform the upgrade on a smaller subset of data, if possible.