el capitan

Hi, I've not used my old Logic Pro 9 software for about four years: moved home, not set studio up since... until now. I had Logic 7, upgraded (with educational discount - I'm a music teacher) to 9. I ran Logic on my 2009 iMac, under OS 10.6.8 and then 10.9.5. I still use my 2009 iMac - it's my...