Thanks, I didn't know the files were hidden in the Assets section.
You're right for the regex.
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Edit:
It says "Note that currently Sigil only provides binaries that work for Windows x86 and x64 and will only run on Vista or newer releases.", but only Sigil-1.2.0-Windows-x64-Setup.exe is available; The last 32 bit release is 0.9.14 (Jun 11, 2019).