It was never officially released as a "portable" application by Corel Corporation. Any portable version you find online is an unauthorized repack .
"Portable" versions of CorelDRAW X6 are not official Corel products. Downloading these from unofficial Google Drive links carries several risks: corel draw x6 portable 64 bit google drive
This is the illegal part. Portable versions include a patched PASMUTILITY.dll or a keygen that writes false activation data. When CorelDRAW asks for a serial number, the crack automatically bypasses it. It was never officially released as a "portable"