The Magic is in the Ring Menues... if you enter the "main" menu with the armor and stats and such, and tap up or down on the D-Pad (or whatever the keyboard command is) you get to Weapons, Items, and on the Girl and Sprite "Magic".
Magic is leveled similar to how Weapons are leveled up, you use the combat magic on enemies, you use the support magic on friends, and each "successful use" gains you a point of skill toward a level up.
There are 8 types of magic total, but each of the two only have 7 magic types. They both share 6, but only one gains access to Luna and the other to Shade (if I remember right).
It has been a while, but I believe Magic caps at level 8, tho it might cap at 9 since weapons also have a final cap of 9 (based on achievement description).
I hope this helps along with the saves people have provided (thanks everyone)
Magic cap used to be 899, so level cap should be 8 with a special magic attack being unlocked at 8 and the likelyhood of that special attack getting higher as you near the cap.
Or so I remember
The trainer is not applying the cheats any longer, tried re-downloading etc, this is not working from what I can see.
Was working less than 24 hrs ago.
'Not applying the cheats' and 'not working' like in ...? What options? All of them? Where? When?
And as you say the trainer worked for you 24h earlier: What happened on your PC in those 24hrs? Any updates or new installations? What did you try to troubleshoot already?