[@Benis] the program is in itself practically portable as SOS build Vovsoft giveaways are pre-activated and do not require activation so the contents of the inno installer can be simply extracted using innoextractor and the “app” folders contents put on a USB drive in a subfolder and it will work just fine. Note that although the program is compatible with XP and above the installer is built with too new a version of Inno installer so it builds an installer that requires NT 6.0 to be executed so the SOS installer cannot be used under XP but one can extract the contents with innoextractor and copy the app folder contents to the XP machine and it will work.
TK