Why would you want to migrate to the lowest possible version of Limesurvey? Why not just go all the way to the newest version? With older versions you will soon have the same problem, missing support, missing security updates, etc.
Today, I would not recommend to install anything else than LS 3.x.
To upgrade from 2.05+ to the newest version I would go in steps. I am not sure if 2.05+ already offers the comfort update, but if so, I would recommend using it.
On the other hand, I am a friend of clean installs, because it offers a good chance to get rid of old "weight". Of course, this means that you have to set up everything from scratch and you might have to do some work, in case your client has many users and many surveys they want to keep.
My first approach would probably be to make a copy of the current database, import it to the new server and then install the newest version of LS using this database. Then you will see the impact and can test, without destroying anything in the actual installation. This should give you access to all the surveys and all the users.
You are not paying any licensing fees, so running two installations in parallel doesn't cost you much (just the hosting).
Data base has changed for sure, but should be updated when you install the new version.
What you need to keep in mind is that there have been changes to the template system from 2.06+ to 2.x and now to 3.x again. Which is also why I recommend to go directly to the newest version, so you do not have to adapt your templates for 2.x and then for 3.x again. I am not sure if this is still valid, but a first version of LS 4.x is expected towards the end of the year (I would guess rather beginning of 2019 though).
Help us to help you!
- Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
- Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.
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