For anyone concerned about running a random executable from the internet, here is the source code for a small C# program that does the same thing as the program @

shared.
This includes a batch script to build the app for yourself. It requires .NET SDK 10 or higher, but the script detects if you don't have it and links you to the installer.
The app will scan for all running GW2 processes and patch the fishing instruction so that the fishing marker follows your cursor. You can run it by double-clicking, or if you want to see the output, you can run it from a terminal.
This way, anyone can check the source code before building it, and make any changes they want for themselves. Here is a breakdown of the files in the archive:
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build.bat - run this to build the program
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gw2FishingPatcher.cs - the source code of the program
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gw2FishingPatcher.csproj - build configuration for the program
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app.manifest - required to make the program always run as administrator (which is required to read/write memory of GW2 process)