Hi all

I'm a newcomer to  Devuan, just made the transition today from Debian.
My install from a live usb appears to have gone fine (so far), I'm running with XFCE desktop.
The only issue that I am stumped with is how to change repository preferences to include contributor and non-free software. In my previous experience with Debian I used a GUI package named software-properties-gtk to make the changes and so was delighted when i checked prior to install today that the package was also available with Devan (version 0.99.30-4).
The package and dependencies all seemed to install as expected, the only slightly unexpected thing was that the shortcut appeared in settings rather than system.
Sadly clicking the launch icon for "Software & Updates" appears to do nothing.
I've tried removing the package, rebooting and reinstalling but the outcome remains the same.
Could anyone advise where I may be going wrong or where I may need to look to get a better handle on where the issue may lie?

Many thanks for any help or guidance anyone can offer :-)