I encounter the same problem just like you.
The system process list does not shown (appear as zeros).
Copy the custom .dll plugin that comes with the installed skin package.
The main cause is that recent version of Rainmeter did not install third party
plugins together while installing custom skins.
Open File Explorer/Windows Explorer and follow the path below.
Documents > Rainmeter > Skins > Harmattan > resources
Copy TopProcess.dll file and paste it into Rainmeter program system by following
C: > Program Files > Rainmeter > Plugins
Refresh the Rainmeter Skin.
I hope it helps.