I tried downloading the zip file but I couldn't find any binary or install file.
Is it available via apt or can we access the latest .deb file somehow?
edit
uname -a
Linux XXXX 2.6.38-11-generic #50-Ubuntu SMP Mon Sep 12 21:17:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
The .tar.gz file (not .zip) downloaded from their website (you did try downloading Linux version, didn't you?) contains a file called
starter
which is a shell script.I have a strong suspicion this file can be used to start Spark 2.6.3