Including the upsell AFTER they customer has paid? (on the thank you page after they have paid)
or Before they have paid ? (when they click the PAY link, but before they actually pay?)
from Sales page -> [one time offer/upsell] ->Payment page (pay here for product 1 or both 1 + 2) ->Download page
from Sales page -> (pay here for product 1) -> [one time offer/upsell] ->Download page
or another path? which you can list
What are the advantages, disadvantages of both paths above? and which are more common?