Just installed Manjaro on my old Macbook.
But the it's not detecting my wifi card.
Network Controller: BCM4360 802.11ac Wireless Network Adapter (Broadcom)
Kernel: 5.4
How can I get this to work since I have no internet connection?
you need to install linux54-broadcom-wl
I have MacBook Air 2013 with the same chip.
I used thunderbolt to ETH adapter.
Where can I get the software though?
Is there somewhere i can download it from on another computer ?
Pardon the noobiness.
I think it is this
I do not know if there are some other dependencies I am not front of the NTB so can not check.
I have never installed from external source but I think in Pamac there is an option to install from external source what means from disk. I guess.
Yeah I tried running sudo pacman -U broadcom-wl-master.tar.gz
But it says it's missing package metadata.
Am I doing the instalation right ?
I can not help you with this never done it. You need to wait when Manjaro guru read your topic 
Use USB Android phone tethering for a temporary internet connection.
Connect the phone to your computer via USB cable.
Enable the tethering option from your phone.
USB Android phone tethering
https://wiki.archlinux.org/index.php/Android_tethering#USB_tethering
Broadcom driver install guide here:
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