[Bug]: InstallShield cmdline is optional

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Command used

https://storage.avermedia.com/web_release_www/C985/C985_RECentral_1.3.0.118.2019091701_Drv_3.3.x.52.exe

### What happened?

```
[Startup]
CmdLine=
SuppressWrongOS=Y
ScriptDriven=1
```