Occasionally, old physical CDs with valid serials appear on eBay or auction sites. While physically owning the CD is legal, using a serial number not explicitly transferred to you by Altium is technically a breach of the EULA. Proceed with caution.
Many engineers still keep their original CDs, which can be ripped into ISO format for modern use. Installation Tips for Modern Windows (10/11) Protel 99 Se Download
As a legacy product over 25 years old, Protel 99 SE is no longer officially sold or supported by Altium. Occasionally, old physical CDs with valid serials appear
The software introduced several innovations that are now standard in modern tools: Integrated Workflow Protel 99 Se Download