I have a native instruments machine mk3, I need serial numbers my old numbers do not work,

Douglas Walker

Can someone help me?

reffahcs

For that you'll need to contact NI support. You can use the link here to open a support ticket https://support.native-instruments.com/hc/en-us/categories/360000053657-Purchase-Account

Once you go to the support page, you'll want to choose account support.