Did Fortinet remove the functionality of accessing internet using SSL-VPN tunnel mode in firmware 6.4.2?
https://docs.fortinet.com/document/fortigate/5.6.0/cookbook/478309/ssl-vpn-using-web-and-tunnel-mode
If so, is there any way to downgrade my firmware?
Nope, they did not, works as previously.
For the second question, you can go back one step back with this partition change:
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