I am getting this error ' An error occurred when processing your serial' . The serial number is correct.
You'll need to contact account support to resolve this, which you can do here - Purchase & Account – Native Instruments (native-instruments.com)
I've deleted your other question on this, that way all the answers will be in the same place
Try updating to latest version of Native Access for your OS (unless you are using a legacy OS , Mac 10.15 and earlier / Win 7 downloads) ! If the doesn't help then please contact N.I. Purchase and Account Support as already suggested by Mykejb !
At least on normal workdays then there are chat support available for assistance with purchases, accounts. Quote : For assistance with purchases, accounts, and Native Access, you'll have an option to initiate a chat session. Simply click on the chat icon located at the bottom right corner, and you'll be assisted by a virtual assistant. If your issue remains unresolved after consulting our help articles, a human chat agent will be available to assist you.
Please refer to the : How to get in touch with our Customer Care or read my Support page functionality changes post here !