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I suppose I had better post the full steps to getting all your windows transparent and blurred instead of the terse thing I did earlier.
- Clone and build Better Blur
- Open System Settings
- Go to Desktop Effects
- Disable blur and enable better blur
- Go to Window Rules
- Add a new rule and set window class to unimportant
- Add Active Opacity and choose your opacity level
- Add inactive Opacity and choose your opacity level
Have a look under ~/.local/share/kwin/scripts/ and see if they’re in there. If not, see if they were installed globally by checking /usr/share/kwin/scripts/