Protel 99 Se [upd] — Download

Last updated: March 2025 – Information checked for accuracy regarding Windows 11 24H2 compatibility.

Released in 2000, this was the industry-standard PCB design tool before it was renamed . It runs on Windows 98/2000/XP and uses a file-based design database ( .DDB ).

Despite Altium’s evolution into Altium Designer (now on version 24), Protel 99 SE downloads are searched thousands of times per month. Reasons include: Protel 99 Se Download

Protel 99 SE was designed for . Running it on modern operating systems like Windows 10 or 11 requires specific workarounds: Other Installers - Altium

If you cannot obtain a legitimate Protel 99 SE download, consider these modern alternatives that can import/export Protel files: Last updated: March 2025 – Information checked for

Supports up to 32 signal layers, 16 mechanical layers, and 16 internal power/ground planes. It includes an integrated autorouter and design rule checking (DRC). Simulation:

Since Altium discontinued support for Protel 99 SE in the mid-2000s, you cannot buy a new license from their website. But here are legal options: Despite Altium’s evolution into Altium Designer (now on

Unlike earlier tools that used separate applications, Protel 99 SE runs all tools—schematics, PCB layout, and simulation—within one environment to eliminate import/export hassles. Design Database (DDB):

Built-in SPICE 3f5-compliant simulation.

Many manufacturing plants in China, India, and Eastern Europe still run legacy production lines that accept only Protel 99 SE output files (especially .PCB and Gerber files from this version). This explains the persistent demand for the software.