While we cannot link to pirate software directly, the most reliable sources for the are typically dedicated automotive forums (such as digital-kaos or mhhauto). Look for threads that have high activity and positive replies confirming the file works.
Once you have your software archive, follow these steps to get up and running. Opcom 1.99 Download
Must disable Driver Signature Enforcement to install unsigned drivers. Installation Guide for OPCOM 1.99 While we cannot link to pirate software directly,