installer stuck on rasbian

[anakuron]

I'm trying to install this to my raspberry pi home setup running the latest raspberry pi os 64bit the installer just echos Set iptables to iptables-legacy and exits there if I manually run iptables --version I get the version iptables v1.8.7 (nf_tables)

I assume the script should in this case check that legacy is not set and then set it as a default using update-alternatives which seems to be installed by default as well, but it doesn't do it for some reason.

/usr/sbin/iptables-legacy exists as well so I don't know why it doesn't proceed to the next step where it should run echo "You need to reboot your machine"

any ideas on how to fix this or what the steps are to set this manually