Past and present installers are always available under releases at the main code hosting location. The latest release will be on top. You can see what’s changed between releases by looking at the ChangeLog.
All releases also have a CHECKSUM.sha256.txt file which includes sha256 check sums of the file posted. This will let you know if you have a bad download or if a build has been tampered with. Going forward release announcements will include the sha256 checksum of the checksum file itself so you can verify that it hasn’t been tampered with either.
Sigil on Windows
Sigil currently provides Windows installers for x86 and x64 and will only work on Windows 7 or newer.
Sigil on Mac
Sigil currently runs on macOS 10.12 Sierra and newer.
Whether a macOS version can run Sigil depends primarily on whether it is supported by the Qt libraries used to build Sigil. Currently, Sigil is built using Qt 5.12.x, which requires macOS 10.12 (no relation between the 12’s!). Therefore Sigil requires macOS 10.12 or newer.
In addition, the macOS .app file (not the .txz) is signed before release. You can use the code sign command line tool to verify the application. Open a terminal and run:
codesign -dvvv Sigil.app
There will be a lot of output. Look for the following, which tells you that Kevin Hendricks, the project maintainer, built this binary: Authority=Developer ID Application: Kevin Hendricks (2SMCVQU3CJ)
Sigil on Linux
Sigil will run on Linux. We try to maintain compatibility with Linux mainly because it’s easy to with Sigil supporting both Mac and Windows and it uses a number of technologies that already support Linux. That said, there is currently no official Sigil binary package for Linux.
If you’re looking to use Sigil on Linux, you can always build it from source. The docs directory in Sigil’s Github repository has instructions that can guide you in that endeavor. You can also look to see if Sigil is available in the official repositories for your flavor of Linux.