So make it avalaible, please...
For exemple, new firefox 6 is very unstable, and i would like to go back on FF5. How come there is no repo like on portable apps for the different versions of a same app ? That's really the basics of smart developpement and/or diffusion of applications and would simplify the life of a lot of people.
Liberkey offert a feature to conveniently update applications, so it's so easy. Going back should at least be possible without having to make a copy of previous installation each time a new app pops out !
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