I want Standard ONLINE for 4 returns
You can either pay per return, or get the 8 return package for 2018: https://turbotax.intuit.ca/x/offers/turbotax-standard.jsp?src=care&cnm=care_fy18_tto_8
The TurboTax Online Standard 2017 8 Return package is only sold by our retail partners and not by us directly. https://turbotax.intuit.ca/tax-software/where-to-buy.jsp
You can request a refund for the one return code that you bought earlier and then buy the 8 Return package. Here are the ways you can request a refund: https://turbotax.community.intuit.ca/replies/2647900