You don't say what Linux distribution you are using, so any commands are guesswork...
If the download manager you are using is YUM , in a terminal window enter
yum clean all
which will erase all partial downloads & clean the caches.
If it's an RPM based system, try
rpm -qa | grep Cheese
That will show if Cheese in installed, if so try removing it with
rpm -e Cheese
To install from a source .tar, typically you cd to a suitable directory to build packages (eg. /usr/src)
untar the file into there, cd in to the directory the package created, then enter
./configure
make
make install
Most source packages have README or INSTALL files, or some recognisable set up instructions on how to build & install the package, together with any dependencies that need installing first.