Rich tea

I have a request regarding this. I purchased Fly Tampa's CYUL but as yet I cannot use it. I currently have Blueprint Simulations CYUL and it will not allow me to remove it. Every attempt I make, even just by un-checking the scenery in the scenery library, I then cannot re-open MFS. I have also tried un-installing from control panel, deleting from scenery library, just removing it manually from the MFS folders, even installing Fly Tampa version over the top, but same result every time. I have emailed Blueprint techincal support and received nothing back. I have purchased many sceneries which required me to remove older versions and had no truoble whatsoever. Has anyone else had this problem or can offer advice? My OS is Windows7(x64). Many thanks