If you're using an version of Pro Tools older than 10.3.5, that does not support AAX plug-ins, you may still be able to use Pitch 'n Time.
Please check the compatibility chart on Avid's website for more information, here.
Remember that you can also trial Pitch n Time for 30 days, via the respective Pitch n Time product pages.
If you wish to purchase an older version of Pitch 'n Time, please get in touch with our Sales team, via sales@serato.com.