When you made a purchase, whether after making an account or a guest, there will be an email attached to the order. If you want to recover your downloads head over to the lost password page and set a new password using that email – https://motionsquared.net/my-account/lost-password/
After that, you will be able to login using your email and new password and see your downloads on your account page.
Make sure to check your spam folder in case the password reset email goes there.