Hi,
Apologize for the issue. Once you have purchased the theme your account has been registered at https://www.themespride.com/my-account/. Login to your account and go to the downloads section, you will get your purchased theme.
Once you have downloaded the theme upload the theme from Appearance -> Themes.
Could you please send us the link of the theme you have purchased so we can send you the documentation.
If you face any difficulty please contact us here we will assist you accordingly.
Thanks