This site specializes in legacy software. While they primarily host installers, the 10.0.0.20 version may be available. You would then need to convert it to portable using tools like Cameyo or ThinApp (advanced).
While downloading older software can be a trip down memory lane, it comes with risks. AVG PC Tuneup 2011 10.0.0.20 Multilanguage Portable download
Includes tools to clean and defragment the Windows Registry , ensuring the system's central database remains stable and fast. This site specializes in legacy software