Conky for Ubuntu Budgie 18.04.1 LTS

Solution 1:

As far I can understand from Conky Manager's source code it can install special prepared theme pack files (they are named *.cmtp.7z).

You can install such themes by pressing the corresponding button "Import Theme Pack (*.cmtp.7z)" on Conky Manager panel:

So you need to download such file from somewhere. I have tested theme named Arch Gotham from OpenDesktop and it installs normally on my Ubuntu MATE 18.04 LTS (I do not have Budgie, desktop is not a problem in current case) with conky-all and conky-manager from our previous Q&A.

Other way to install is to download *.cmtp.7z file, then drag it and drop it to the Conky Manager window.

As the result you will get the window shown below

and theme/widget will be added to the list and may be shown on desktop (if enabled):

Also you can check big theme collection Jesse_Supreme_conkys.cmtp.7z from Jesse Avalos.

Notes:
1. pre-installed themes are also in the *.cmtp.7z format (their archive is placed in /usr/share/conky-manager/themepacks/default-themes-2.1.cmtp.7z).
2. Conky Manager does not help to install themes from other archive types, but will show location of their conkyrc- and *.cmtheme-files. You should use some manual methods to install such themes (simple copy of contents to ~/.conky may work).