The term "1.09" refers to the game version. For Halo CE, version 1.09 is an update that included various fixes and improvements.
Because version 1.09 is an older build, many legacy "aimbots" are detected by modern anti-cheat measures or may contain malware. High-quality community projects generally focus on "quality of life" improvements rather than exploit tools. What "Extra Quality" Aimbots Claim to Offer halo ce 1 09 aimbot extra quality