You can update your billing information through the Linguise dashboard by navigating to menu: Home > Billing details.
Once updated, you can download again your invoices by clicking your credit card number.
I have attached a screenshot to help: https://drive.google.com/file/d/1Lc7BeoSRHnBKbw4bl7Qu6DUvbtby2pfb/
Detailled documentation here: https://www.linguise.com/documentation/debug-support/billing-edit-credit-card-info-and-invoices/