Download of THRSim11 5.30 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This free program was originally produced by Harry Broeders.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The software lies within Development Tools, more precisely Debugging Tools.
From the developer:
The Motorola 68HC11 microcontroller was a popular microcontroller used in many applications. With the THRSim11 program you can edit, assemble, simulate and debug programs for the 68HC11 on your windows PC. You can also use THRSim11 to debug the program on your target EVM or EVB compatable board. The simulator simulates the CPU, ROM, RAM, and all memory mapped I/O ports.
You may want to check out more software, such as TiEmu, gDEBugger or Silos, which might be related to THRSim11.