When I right-click the Rainlendar icon in the system tray and select the 'Windows' tab there is no Calender.Horizontal or Calender.Vertical option, there is only Calender.Grid (I'm just mentioning this because I saw this in someone else's skin I don't know if you used the same function). So the next thing I tried was right-clicking again and selecting the 'Options' tab and going to 'Skins' and selecting your skin in 'Advanced' but I couldn't find any way to switch to Veritcal or Horizontal skins. The only thing I could do was switch the colour of the event days. I'm new to Rainlendar, thanks for your help.
go to Options - Skins - Advanced. choose the skin. on the left in the area marked Available Skins you should see Pica listed - click the + to texpand the tree, and the horizontal and vertical calendars should be there. choose the one you want, then click the arrow in between two windows that points to the right - that should send it to the Active Skins window, and the skin should show up. to remove an active calendar, send it back with the left-pointing arrow.