[2019] I cant add an email to my account to switch to the standalone client

Depending on the email address you are trying to add, it may be possible that the email address is already in use on another Path of Exile account.

An email address can only be used on one account at a time. If you suspect this may be the case, we are happy to delete the empty/extra account for you to free up the email address. Please just email us at [email protected] with your request. :D