The emulator requires a PS2 BIOS file to boot games. Legally, you are required to dump this BIOS from your own physical PlayStation 2 console using a homebrew application. Step 3: Get the Tekken 5 Game File (ISO)
The search for "Tekken 5 for PC highly compressed just 30 MB" is a classic case of wishful thinking meets internet scammers. True hyper-compression at that ratio is science fiction. However, through smart ripping (removing movies/music) and efficient emulation, you can enjoy one of the greatest fighting games of all time on a low-end PC with less than 300 MB of data. Tekken 5 For PC Highly Compressed Just 30 Mb