BetterDiscord installer isn't detecting my Discord installation
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This answer will work for Windows users only.
There are two main reasons for this, and they are as follows:
You have Discord installed in ProgramData, rather than the local AppData.
Change the path of your installer from what it is to %programdata%/%username%/Discord/app-1.0.9005/resources
You have an old version of Discord in your Discord installation folder, and the installer is picking it up.
Click Browse and choose the folder named app-1.0.9005.