It is possible for you to install regular GlassWire on PCs without steam.
Here is how you can:
- Open your steam client.
- Click on Library
- Click on Software
- Select GlassWire from the list of software on the left
- Click on CD Key towards the right
- A box will pop-up displaying your CD KEY
- Copy the CD KEY and use it to activate GlassWire
- Bob is your uncle!
Hope this helps!