We started the bluetit service, put the airvpn username and password into goldcrest.rc, and ran "goldcrest -O". The VPN was set up correctly, confirmed in the browser. We restarted the laptop, and noticed that the service did not start:

[pc-user@localhost ~]$ systemctl status bluetit
● bluetit.service - AirVPN Bluetit Daemon
     Loaded: loaded (/etc/systemd/system/bluetit.service; enabled; vendor preset: disabled)
     Active: failed (Result: exit-code) since Wed 2020-12-02 19:47:23 AEDT; 3min 56s ago
    Process: 640 ExecStart=/sbin/bluetit (code=exited, status=1/FAILURE)
        CPU: 9ms

Dec 02 19:47:23 localhost.localdomain systemd[1]: Starting AirVPN Bluetit Daemon...
Dec 02 19:47:23 localhost.localdomain bluetit[640]: Starting Bluetit - AirVPN OpenVPN 3 Service 1.0.0 Beta 2 - 27 Nov>
Dec 02 19:47:23 localhost.localdomain bluetit[640]: OpenVPN core 3.6.6 AirVPN linux x86_64 64-bit
Dec 02 19:47:23 localhost.localdomain bluetit[640]: Copyright (C) 2012-2020 OpenVPN Inc. All rights reserved.
Dec 02 19:47:23 localhost.localdomain bluetit[640]: Bluetit is already running or did not exit gracefully on its last>
Dec 02 19:47:23 localhost.localdomain systemd[1]: bluetit.service: Control process exited, code=exited, status=1/FAIL>
Dec 02 19:47:23 localhost.localdomain systemd[1]: bluetit.service: Failed with result 'exit-code'.
Dec 02 19:47:23 localhost.localdomain systemd[1]: Failed to start AirVPN Bluetit Daemon.

We deleted the lock file, and then it did start. In my opinion, a normal way to do a lock file is to write the PID to a file in /run and to check whether a process with that PID is running. So if the system crashes, the PID is not present and the service can start.

Then we tried goldcrest -O and goldcrest --recover-network, which failed:

[pc-user@localhost ~]$ sudo goldcrest --recover-network
2020-12-02 19:57:09 Reading run control directives from file /root/.config/goldcrest.rc
Goldcrest 1.0.0 Beta 2 - 27 November 2020

2020-12-02 19:57:09 Bluetit - AirVPN OpenVPN 3 Service 1.0.0 Beta 2 - 27 November 2020
2020-12-02 19:57:09 OpenVPN core 3.6.6 AirVPN linux x86_64 64-bit
2020-12-02 19:57:09 It seems Bluetit did not exit gracefully or has been killed.
Your system may not be working properly and your network connection may not work
as expected. To recover your network settings, run this program again and use
the "--recover-network" option.

Even when we run it with --recover-network, it is still asking for me to run it with --recover-network.