Hello Gilberto,
It seems that there is no dedicated folders in 0.89-8 neither for "snippets" nor for "plugins" in the portable version. I played some time ago with language adding in the portable version as well. As far as I remember, Andrey replied in some post that he changed some things for this version and this is not possible anymore. I guess that as well, due to those changes, the installation (*.msi file) of 0.89-8 requires uninstalling the previous version first in order to avoid unwanted problems.
Regards,
Radovan
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"