If you have a Razer product that requires the version 2 drivers and the install fails because the installer can’t find “Razer Synapse 2.0.msi” try the following:
During the initial install step, the installer flashes up a message to the effect that it is extracting files. If you are really quick then you will see it has extracted the above file. DO NOT PRESS NEXT.
Open explorer and search for “Razer Synapse 2.0.msi” on “This PC”. Copy the file to your desktop. Continue with the install. When the installer asks for the file you can now use the browse option to go find it.
EXCEPTION
If you have more than one account and you are not logged in as the administrator, you may find that the file has been extracted to the administrator’s temp directory (C:\Users\Administrator\AppData\Local\Razer), making it impossible to access without your admin password.