It depends how you would like to count upgrades. Most commonly known i'm sticky on OpenOffice 2.02 portable instead of all following updates, upgrades and forks to LibreOffice, because OO2.02p is smaller, runs without any local pc configuration and installation just from any media and does anything i need. For emulators improvements could have a negative effect on some software to be emulated. Especially during beta testing it's good to have a backup or history of the previous releases. I'd like to be better safe than sorry.