I am installing the April version on my laptop. During the install I took advantage of the internet and updated the software. At the end of this I got a recommendation to do an immediate reboot. I followed this and everything appeared normal. Now I am blocked from the internet!!
The laptop is an HP probook4730. The EndeavourOS is the bog-standard iso. I was quite happy testing the iso before install.
One thing: just before the reboot. I attempted to install a firewall. There is no evidence that this went ahead.