The module worked in a first test with no authentication. 
Great work as usual!
I used WAPT to install abiword on XP, 7 and 10.
Win 10 has the waptclient management console, XP and 7 have agents.
I think we should not stop apache to have a full Nethserver and instead use another port and if possible apache reverse proxy (nice to have). From the documentation the port change should be supported (at least on Windows):
https://www.wapt.fr/en/doc/waptserver-install/windows/change-port.html
I already tested the port change here and it worked without auth.
Minor issue:
Configuring nginx ends with an error but it works though.
Aug 30 23:04:41 testserver systemd: Starting The nginx HTTP and reverse proxy server...
Aug 30 23:04:41 testserver nginx: nginx: [warn] "ssl_stapling" ignored, issuer certificate not found for certificate "/opt/wapt/waptserver/ssl/cert.pem"
Aug 30 23:04:41 testserver nginx: nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
Aug 30 23:04:41 testserver nginx: nginx: configuration file /etc/nginx/nginx.conf test is successful
Aug 30 23:04:41 testserver nginx: nginx: [warn] "ssl_stapling" ignored, issuer certificate not found for certificate "/opt/wapt/waptserver/ssl/cert.pem"
Aug 30 23:04:41 testserver systemd: Failed to parse PID from file /run/nginx.pid: Invalid argument
Aug 30 23:04:41 testserver systemd: Started The nginx HTTP and reverse proxy server.