Hello Justkels,
Since the version of Cross was a physical copy on an install disc, we have no way of keeping a record of which license would belong to which piece of hardware.
If the controller was used you will need to contact the seller on Ebay and ask them to send you the license that should have came with your SDJ 100 A1, you can then register your license in your profile. After that you should be able to access the version of Cross that is linked to your controller, in the downloads section of the forums.
Please make sure that the seller is not currently using the license. If they are still using it, they will need to remove it from there user profile before you can register it to yours.
If it was a new SDJ 100 A1 that for some reason didn't come with the bundled software, you can send proof of purchase (such as the receipt/payment confirmation email) to the
support@mixvibes.com account and we can issue you a new license.
Best Regards,
Adam @Mixvibes