Install path cannot be specified when installing

### Expected

When running the installation program, there should be an input box to let me input a file path.

### Observed

When running the installation program, I can only choice install for me(install in "c:/users//appdata/local/programs") or install for everyone(install in "c:/program files"), but cannot choice any other file path.

### Reproduced

1. Download Simplenote-win-2.22.1-x64.exe
2. Start the exe file.
3. See error...

### Where did you see the bug

- OS: Win11 21H2
- Simplenote app version: 2.22.1

Start by reproducing the issue with Simplenote-win-2.22.1-x64.exe on Windows 11 21H2 and inspect the installer's current per-user and per-machine choices. Identify the installer entry point that controls the destination, then add a selectable path while preserving both existing modes. Done means a chosen custom path is honored and both existing installation options still work.

Written by the indexing model from the issue text.