Can't get to the installation screen

[Evergrowing]

I tried to install AbanteCart on a rather old virtual Kali Linux. When I open my browser to install AC, I get the message "simpleXML functions are not available".
So I tried to install several php7.0 packets (mbstring, zip, xml). But I only get the error "couldn't find any package by glob/regex" for all 3 of them. Not even sure whether this is the right approach, just found it somewhere on StackOverflow.
What do I need to do to pass this error? Thank you

[CTGO.co]

Hi!

Check if next Extensions blocks active or not on php version: xmlreader, xmlrpc, xmlwriter. They should be active.

good luck

[Basara]

Do not forget to restart your server when you add new php extensions

[Evergrowing]

Check if next Extensions blocks active or not on php version: xmlreader, xmlrpc, xmlwriter. They should be active.

I dont understand what you mean, can you clarify please?

[CTGO.co]

Check if next Extensions blocks active or not on php version: xmlreader, xmlrpc, xmlwriter. They should be active.

I dont understand what you mean, can you clarify please?

you need to activate those Extensions on your php version.

[Evergrowing]

root@kali: phpenmod mbstring
WARNING: Module mbstring ini file doesn't exist under /etc/php/7.0/mods-available

apt install php7.0-mbstring php7.0-zip php7.0-xml
see error above. I read here
stackoverflow dot com /questions/49570107/how-to-install-php7-0-mbstring-in-ubuntu-17-04
that this version is not supported anymore? Not sure if this is only for another OS though.
This all seems very weird to me.