Manga studio 5 is a little confusing as it's branded as 2 different things. There's Clip Studio Paint , which you can get a trial for here
www.clipstudio.net/en/purchase… and then there's it's counterpart, the exact same program in the West renamed to Manga Studio 5 ;v;/
You can also buy the program on that site too iirc
I'd recommend clip studio as it's faster to update (clip was created by the Japanese and importing the updates over the manga studio 5 I'd imagine would take some time) I also use clip and wouldn't really know too much about getting a trial for Manga studio but I'm sure it'd be easy enough to find with google ;a;