No presale code is required to purchase SarahMcLachlan.com presale tickets, however you must be registered with the website and logged in to see presale information and links in the tour page that are available for members only.
To register for free account, visit: https://members.sarahmclachlan.com/Identity/Account/Register
To login to your account, visit: https://members.sarahmclachlan.com/Identity/Account/Login
To purchase tickets, sign in to your account on the SarahMcLachlan.com Tour page and locate the show that you're interested in. Presale information/links will be directly right of the tour date. Click, select your tickets and continue through the checkout process.