I don't have any other games installed on that 3ds no , its out of the box new. I found the save3ds_fuse.eve file in the bin folder on my pc if thas the file. Have yet to do anything with that file since no where I looked mentioned it. I'm certain i have the 3dsx files in the right location that game with the zip. Would having a bad Seeddb file cause something like this? only part of the process that I had difficulty getting. I did grab one from some site.Hmm.. Do you have other games installed on your 3ds? Do they appear & work? If not, your title.db file might be missing (or you did delete it accidentally?), and that's why it won't install any cias for you..
You should search for "save3ds_fuse" file in the custom-install folder and see if it's there or not.