Problems with PowerCMS

I have just installed Design Extensions and cannot get PowerCMS to work. I had previously installed this extension and it worked. However since migrating to CC 2017 it doesn't. If you visit www.alanco-alamatic.com and go to About us you will see error messages that say the files cannot be found. In an attempt to rectify this I went to your extension menu list (in Dreamweaver) and under CMS I found three entries

a. Add content to PowerCMS
b. Insert content to PowerCMS
c. Reload content

None of these seem to do anything and I no longer see the "set up" form that allowed me to set connections etc. I need to check that the stated paths are correct.

I am attaching a couple of screenshots to assist

a. Shows the error messages when the management.php file is selected from the sub About us menu is selected.
b. Shows the database links I used previously when it worked.

Before it stopped working we used to get a window asking us to login and our password but we no longer get that window.

I would like to get this extension back to the position I had when I first installed PowerCMS. Can I do that and start again? Can I uninstall the links from the
web pages to totally uninstall this extension?

I have no idea why it stopped working or what needs to be changed to re-instate the same.

I would appreciate your assistance in this matter.

Peter

Update

I researched the matter further and found that a path to the server was incorrect. I have rewritten the code, in the various pages, and now I have access to the CMS content of those pages again.