It is always advisable to use the most recent version. The latest modules are always supported in this and all known bugs were also resolved.
For example, if you enter a serial number and the correct module info does not appear, then you will probably not work with the most recent software.
A newer version will always be able to open the older files (.QDB), without data loss.
You can find the latest software, accompanying manual and version management on our download page:….