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Each new MU.LAB version will open sessions made in the previous main version, but might not open sessions made in older versions.
This is because the MU.LAB code base is regularly 'cleaned up' from older compatibility code, for reasons of coding efficiency, which is important towards the future of MU.LAB.
Of course MUTOOLS will always try to maintain the highest possible compatibility between successive versions of MU.LAB, but there might be cases where you'll have to upgrade your sessions towards the new MU.LAB.
If you have (a) neatly organized session folder(s), it should not be a big issue.
The key versions to upgrade sessions are:
- LUNA PR 8.4
- MU.LAB 1.1
- MU.LAB 2.04
- MU.LAB 2.7
- MU.LAB 3.0
If MU.LAB 3 cannot open an older MuSession file it will tell you which version saved the file, so you know which versions to use to upgrade the file.
Example: Long time ago, you made a cool session in LUNA PR8.4. Now you want to load it in MU.LAB 3.
Do this:
- Backup the original session (not necessary but highly recommended)
- Open the session in MU.LAB 1.1, save it again
- Open the session in MU.LAB 2.04, save it again
- Open the session in MU.LAB 2.7, save it again
Now you'll be able to open the session in MU.LAB 3
From MU.LAB 2.7 onwards there is the "Upgrade Sessions" function in the File menu which allows to upgrade all sessions in a folder at once.
You can find the necessary older versions here: www.mutools.com/mulab/past-versions
Registered users who need their old LUNA/MU.LAB key to unlock one of these past versions, mail to  .
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