Why is this version suspicious? Most legitimate software updates are released to patch security holes or add features. Version 2.2.4.2 is not the current build of FWsim (which has moved on to newer iterations).
If you landed here looking for that file, let’s pump the brakes for a moment. Here is the reality check regarding version 2.2.4.2, the "MPT Patch," and why downloading it might be the fuse that burns your computer down. FWsim Pro 2.2.4.2 Patch-MPT Download Pc- - Google
If you find search results or forums offering a “patch-MPT” for FWsim Pro, here’s why you must avoid them: Why is this version suspicious