Could be several causes, and it also depends on how you installed it.
locate database is generated on a schedule via
cron. If you create a file, update the database via
updatedb, delete the file you just created, and then try to
locate it, it will still be in the database. Regenerate the database with another run of
updatedb and the file won't show in
Secondly, if you installed it via
apt-get, etc. then
apt purge pscxr or
apt-get purge pscxr should do it, BUT it will only remove files that the install process created. If you edit a file and your editor automatically creates a backup file, those backup files will still be there, as will the directory path to the files. Note that if you needed other packages for dependencies, you'll need to also run
apt-get autoremove or
If you installed from source, if you have the source directory you ran the
make commands in then you MIGHT be able to do a
make uninstall BUT the success of that script would depend on the makefile itself. Not a lot of source packages include a uninstall in the makefile though...
So... as root run
updatedb then try your locate command, and unless you edited or copied files into the paths that are in the package it should all be gone...