Every time i open my LR 2015 catalog, it requires me to upgrade it AGAIN to LR 2015. How do i get out of this endless loop? Help!
You are not opening the LR 2015 catalog. you are opening your old catalog from the older version of LR you were using.
Do a search of your system for .lrcat (that is .LRCAT) to see how many LR catalogs are on your system.
In the LR preferences on the General tab look for the section named Default Catalog and see what it is set to. By default it should be set to Load most recent catalog. If it is set to anything else change it to that setting. Also make a note of the PATH to the new LR 2015 catalog and you can browse to it in that Default Catalog area.