Problems on locally hosted WP

So I have a problem with Updraft Central (Version 0.3.6) which is installed on a local WP site with MainWP plugin installed. The two “child sites” with latest version UpdraftPlus plugin have been tested and works fully.
I cannot deactivate MainWP as I have set it up with security keys to my sites. The problem is best described in pictures:

1. The basic WP page with two sites:
https://goo.gl/photos/kDA36bJHdXn4EkDi9

2. WHen I try to access the sites, I get a dropdown communications error box:
https://goo.gl/photos/tZL7hAtBR8rqM1zL7

3. Following the link to test other methods gives this:
https://goo.gl/photos/fpeQ3dRwQF5eZwL16

4. Clicking on “Open site configuration” gives:
https://goo.gl/photos/DJNbPtAsT9WGNtyG9

Sorry if the pictorial story gives you problems but each saves 1000 words (supposedly)

Any sugestions why it does not work? If no answers I’ll try it on it’s own without other plugins.

(problem still there with Windows firewall disabled)

System details below
——————–

Windows 10, tried both Chrome and Firefox
Emsisoft anti-virus, Windows firewall

Using DesktopServer (localhost)

WordPress 4.5.2 running Twenty Sixteen theme (everything updated)

3 Plugins:

Akismet (not activated)
Activate | Edit | Delete
Version 3.1.10 | By Automattic | View details

MainWP Dashboard
Deactivate | Edit
Manage all of your WP sites, even those on different servers, from one central dashboard that runs off of your own self-hosted WordPress install.
Version 3.1.3 | By MainWP | View details

UpdraftCentral Dashboard
UpdraftCentral website | Settings | Deactivate | Edit
Manage your backups from a central dashboard
Version 0.3.6 | By David Anderson + Team Updraft | View details

https://wordpress.org/plugins/updraftcentral/