NOTICE: This question falls into the FAQ page...
What type of questions won't be answered by Vocaloid Wiki
Questions on How to use Pocaloid / download / ripped software.
They can be purchased on select online stores, such as the official Vocaloid store (https://www.vocaloid.com/en) or the company websites; Sonicwire for Crypton vocals (https://sonicwire.com/) and PowerFX with their english vocals (http://powerfx.com/categories/vocaloid) are available as well, though youre going to find the most variety on the first site. You can also purchase physical copies with disks and sometimes bonuses on amazon and ebay.