If you are searching for older versions, you are likely choosing between the (Stable, classic UI, lighter) and the 7.x branch (Newer features, ZTNA tagging, heavier telemetry).
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When you Google "FortiClient VPN download older versions," the top results are rarely Fortinet. You will see sites like: If you are searching for older versions, you
Go forth and tunnel safely. Or at least, safely-ish. forticlient vpn download older versions
If your older version installer refuses to run because "A newer version is already installed":