Upgrade from Mantis BugTracker 1.2.17 to 2.25.2

[fvitolo]

Hello,
i need support to upgrade current Mantis installation from version 1.2.17 to 2.25.2.
Could you please tell me if there is some issues? I need to migrate all current ticket, is DB structure changed between the versions mentioned?
Is there a procedure guide about these version upgrade?
Is it possible to performe upgrade in place? In these case could you share the correct procedure?

[cas]

Check out the admin-guide in the mantis\docs\en-us directory

[fvitolo]

Hi, thanks for reply.
The only guid i found is https://www.mantisbt.org/docs/master/en ... in.install, but it is not indicated if the procedure is correct for all starting version (in my case 1.2.17).

[cas]

Yes, you can follow that procedure, no problem. Just run it step by step
Please do not forget to, like always, make a backup of program & database before you start.