iTunes incompatability between 8 on High Sierra and 9 on Mojave
I have my iTunes library installed on my NAS. By doing this I both save precious room on my SSD and also I can access it from all my machines (MacBookPro 2013, 2 x MacbookPro 2010, Win10 PC). I just updated my newest MacBookPro to Mojave which (I now find out) includes iTunes 9. Having got iTunes working on Mojave I now find out that iTunes 8 on High Sierra cannot open the library as it has been "created with a later version - please update your OS".
You can see where this is going... I cannot install Mojave on my older MacBooks and I cannot see a way to update iTunes to v9 on High Sirerra.
Any thoughts anyone??
MacBook Pro 13", 10.14