Fedi Halo Custom Edition Prep:
Install Halo from here: http://hce.halomaps.org/?fid=410
Install Patch from here: http://hce.halomaps.org/index.cfm?fid=6798
Install MSXML4 from here (fixes in-game chat): https://web.archive.org/web/20210506101448/http://download.microsoft.com/download/A/2/D/A2D8587D-0027-4217-9DAD-38AFDB0A177E/msxml.msi

Installing the MSXML4 parser will allow in-game chat to work, just tested it

** LET ME KNOW WHICH KEY YOU USE SO WE DON'T RUN INTO DUPLICATES **

Halo 1 CD Keys (YMMV):
mcxmm-y29c6-dr36c-b6w4t-t9p73 (Used by @tyler )
RGGD9-BYCC4-6J6FV-VPJJQ-HCXHW (Used by @tyler 's wife&son)
WWCXQ-QKQ4V-QRWKQ-YDVGJ-FCRYJ
MCXMM-Y29C6-DR36C-B6W4T-T9P73
PGQTG-4X4J3-68M87-B28TR-J2CBJ
W4WMQ-BP7J4-YPV8D-9HYK3-KQTVW
G9QK2-22KV6-TFXCR-V3Y9M-2CCBJ
M4GHF-MMRWK-MW9BD-B76JK-6P8MJ