Aloha a,
1-Quit Cubase. (if running)
2-Go to your ‘Applications’ folder and find the Cubase 6.5 app.
3-Select it.
4-Hit Command ‘I’ (the ‘get info’ box opens).
5-Near the top/centre of that box there is a lil check box for either 32 or 64 bit.
5-Choose either 32 or 64 bit and then re-start Cubase; and bob’s yer uncle’.
{‘-’}