Usg20-vpn firmware upgrade

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Hi, I have a USG20 VPN that needs to be updated.
Current firmware is 4.30
The latest upgrade says "If the firewall running with previous version then ZLD5.00, we recommended upgrade to ZLD5.10 C0 or later version to Standby partition first before upgrading to ZLD5.31"

And the notes for firmware 5.30 (oldest available at the product page at https://www.zyxel.com/support) says: "Recommended upgrade to ZLD5.10 Patch0 or later version first before upgrading to ZLD5.31"

Can I please have a link to the all previous version of the firmware for the USG20 VPN ?
Thanks !

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