Version 2.00+ Build 121209
To be honest, what you REALLY need to do is update your installation. This version is ancient and the very first release of this branch of Limesurvey. After that, there are usually bugs, etc discovered and fixed.
But not only that. Since then a number of new versions have come out, many of which are also already EOL.
Your version of Limesurvey was released on 19/12/2012, so your installation hasn't received bug fixes, security patches or updates since the end of 2012. It is April of 2023 now. So for over a decade, your installation hasn't received any updates, nothing. I think this is the new record.
Given that this might be used to collect health data you should really do an upgrade.
Now, to your issue: a direct update to the latest version might be worth a shot, but given that you are skipping at least 3-5 major releases of Limesurvey, there is of course no guarantee. But it is worth a shot.
If there aren't many active users and active surveys I would probably install a recent version (LS 3, 5 or 6, bur given that LS3 will be EOL soon I would rather think of LS5 or LS6) and install it from scatch, and then setup the users again and maybe copy the surveys via LSS (only survey structure) or LSA (also includes responses) over.
What would I try to do: I would create a copy of the current installation and setup a new database based on this (ideally on a test server, just to see what happens when you run the update). Then I would install LS5/6 using the credentials of the database copy and see what happens.
But please keep in mind, a lot has changed in LS (surprise surprise, it has been almost 11 years), and survey themes and workarounds used will most probably not work in the newer versions.
So first you need to get the detailed information about the database server, credentials, etc. to make at least security copies of the database.
Given that a change in the major version of Cent OS the version of PHP often changes as well might not allow to just copy the contents of the old folder to the new server.
This is also something you can try, but I fear if this works, your ancient LS 2.00 will be used another 1000 years or something...
I can't believe this. I feel like an archeologist.