The first link is the correct one (we are still running some analyses for the old website) but for the latest release of COMODO System Cleaner use the download link posted on our forum: http://download.comodo.com/csc/download/setups/CSC_SETUP_2.0.111095.7_xp_vista_server2003_win7.exe
The difference in size for the two versions comes from the fact that starting with version .5 the help file is not inbuilt anymore. The help manual is available online.
All I could find was
CSC_SETUP_2.0.110158.6_xp_vista_server2003_win7.exe 9,977,384 bytes
CSC_SETUP_2.0.110158.6_xp_vista_server2003_win7_32bit.zip 4,724,443 bytes
I saw no evidence of 2.0.111095.7 - please give a link.
I much prefer a Portable version, but there is a very nasty defect in version
CSC_SETUP_2.0.110158.6_xp_vista_server2003_win7_32bit.zip
It seems to be portable when being unzipped,
but if I click on the button to update then it starts installing something,
presumably the NON-portable version of 2.0.111095.7
CSC 2.1 had some changes in the Update component and that’s way it cannot properly update. Because of this, we recommend you to uninstall the current version of CSC and clean install the latest one. And please make sure you manually delete all leftovers of CSC 2.0 before uninstalling the new one.
The update will no longer be an issue starting with the next release.