Wow, it took me awhile to notice that I was getting confused about the plugin on app store. The plugin is for the Somfy URTSI, but I was assuming (don't know why) that as it was a somfy plugin, it would work with the RFXtrx433e... Different things,

Well, now I am going to restart my Vera Plus and install the last trunk (1.0), as Lollodomo no longer is supporting it, as he has moved on... to openHAB. If he did, I suppose the man knows what he is doing... The way I see, if I owed Vera or Mios, whatever, Lollodomo would be working for the company having a top manager position, so he could help give some direction to it.
Nevertheless, I am going to try and make my blinds work. If they don't, after crying, I will be back claiming for help.
But my doubt remains: as my blinds and curtains use somfy RFY protocol, it does not appear as a option on RFXtrx Settings... should I then disable everything, as I only have Somfy RTS stuff?