1. I am away from my reference material at work, but there are a couple of things you can try for this.
* FuBar organizes addons into bars at the top and/or bottom of your screen. It is compatible with or can get plugins for a large number of other addons' minimap icons. When I added FuBar to my UI, it took 90% of my buttons away.
* There are other addons, both Ace and non-Ace, that can consolidate your minimap buttons, but I can't recall the name(s) offhand. A small amount of searching should find them quite easily.
2. Try completely removing the old Decursive folder (along with any other addons that are part of the package) from your Addons folder before installing the current version. Old files hanging around can screw up the installation.