I am not sure about this, since I am not a professional programmer, but here is what you can try:
1) Remove the GlassButton.vb class from the "Purchased Controls" folder
2) Right click the folder and click "Add" --> "Existing Item" and then browse to GlassButton folder, wherever you extracted it from downloaded zip file, go to GlassButtonVB folder and select GlassButton.designer.vb
3) Ignore all the errors and just the do same steps and add GlassButton.vb (I answered "No" to a prompt about overwriting the existing designer vb file)
4) The only warning that I got was referencing the XML comment for a tag with 'cref' attribute, which it would ignore anyway (it will go away if you remove "<" and "/>" from that line)
5) Close all open forms and rebuild the project
If you still have errors then you might need to add or check references, right click the project and go to Properties window, select References and in the Imported Namespaces try to check all those that appear on top of the GlassButton.vb as "Imports".
I just tried these 5 steps listed above in version 3.8.4 and it worked.
Depending on the AHMI version that you are using, you might get some other errors once you try to create AHMI GlassButton control (this since every new version might implement code changes in certain classes). Try to use common sense and just copy and paste, or remove, one property at the time to see how it reflects on the control. In the file that was posted previously you might notice that there is no PLCAddressValue property, this since there is no "Value" property either so I didn't think that it would do anything useful and removed it (which I might be wrong about).
From what I've seen so far, some output types might not work correctly (Momentary Set, Momentary Reset, Set True, Set False appear to work fine but I couldn't get Toggle and Write Value to work with OPC Simulator). <-- Tried this with MicroLogix PLC and Toggle works fine, only WriteValue I am still not sure how to use properly (if Archie could provide a hint that would help)