(Note that 4.1.0 (build 4024) - 05 June 2024 remains available, but usage of this version is not recommended - particularly for Davis stations - and the included utility in this distribution for migrating to v4 is known to contain errors affecting conversion of dayfile.txt)
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
I have just tried to download this to create a Raspberry Pi image. I tried both the 32 and 64-bit versions. I'm pretty sure the zipfiles are corrupt. The Raspberry Pi Imager software reports "Error extracting archive: ZIP decompression failed (-5)" I then downloaded it to a Ubuntu desktop ...