Yes please compare the checksum on the Win64 installer for Sigil with that specified in the Checksums file we have posted (and copied to here as well). If they differ in any way, do NOT install what you downloaded, as something has been addd or removed from what we posted.
This is an sha256 checksum.
Code:
4b585d2670d67623beab9ec7aced0021811d1630ad134193d07d1dee03987f23 Sigil-0.9.9-Windows-x64-Setup.exe