Need XP agent please

Hi, I have a not for profit school lab with 25 xp SP3 machines that are locked down for specific web sites, highly restricted user accounts and behind a smart firewall.
They can’t afford to purchase updates for anything, so I am hoping someone can post or link an old version that still works. Thanks.

Comodo/Itarian technicians

What is the format of the URL to download a specific previous version or can we view a complete list?
The link to the current version is

@Rickkee The agent you need for Windows XP is 6.28…itsm_agent.msi,
You will need to manually enroll the endpoint, which SethHD can hopefully explain.