I can't install Razer Synapse

I’m having the same issue. I’m following this thread for when Razer replies.

I’ve had the same issue for almost a week and just figured it out last night! I don’t know if the same thing happened to you, but I figured I would share what I discovered just in case. I’m also running Windows 11.

The first time I tried opening the installer, nothing happened (or so I thought). Every time I tried opening the installer after that, I found that error file. After uninstalling Synapse 3 completely and deleting and redownloading the Synapse 4 installer, I found that I didn’t actually get the error file the first time. But every time I tried opening it up after that, I got the exact same error file. When I tried to delete the installer, I got a pop-up that said I couldn’t delete it because the installer was open.

Turns out it was open (running in the background) and somehow not showing up anywhere? I was able to confirm this by finding the process in Task Manager. Once I ended all open Razer processes in Task Manager, the installer popped right up. I had no issues getting Synapse 4 installed after that. I imagine the “permission denied” is popping up because it’s already in use, and the program won’t let you open up a second instance of itself.

Fair warning: Based on a support page I found after the fact, I would advise against uninstalling Synapse 3 completely, as it may mess up your ability to transfer over any profiles.

tl;dr: Closed all open Razer processes in Task Manager and that worked. If you can help it, don’t uninstall Synapse 3, as it may interfere with transferring profiles.

Hope this helps! Let me know if it works for you too!