We do not have a download file for the latest version (45.0.22), but you can try downloading it from the developer's site
Download version 41.0.2 from Software Informer
Scanned by 73 antivirus programs on Jan 24, 2024.
The file is clean, see the report.
Version: 41.0.2 (x86)
Date update: Jun 16, 2023
File name: xulrunner-41.0.2.en-us.win32.zip
Size: 38 MB