How to terminate and uninstall older version of app before upgrade

Hi

If I see how VLC package is done, I see this. 

success
2023-04-28 09:15:45.055 Starting to install: VLC Media Player
2023-04-28 09:15:45.283 Running command: cmd.exe /s /c %WINDIR%\System32\taskkill.exe /f /im vlc.exe
2023-04-28 09:15:46.619 Step executed successfully
2023-04-28 09:15:46.790 Running command: cmd.exe /s /c "C:\Program Files (x86)\VideoLAN\VLC\uninstall.exe" /S
2023-04-28 09:15:47.511 Step failed, error mode is set to Continue
2023-04-28 09:15:47.695 Downloading from: https://download.videolan.org/pub/videolan/vlc/3.0.18/win64/vlc-3.0.18-win64.exe
2023-04-28 09:15:50.044 Running command: vlc-3.0.18-win64.exe /S
2023-04-28 09:16:08.520 Step executed successfully

First vlc.exe is terminate if vlc. is running.
Then VLC is uninstalled silently by uninstall.exe
Then VLC is downloaded and installed

Nice

I have created a package that should install Lightshot

In the first step I run these two commands by Powershell

cmd.exe /s /c %WINDIR%\System32\taskkill.exe /f /im lightshot.exe
cmd.exe /s /c "C:\Program Files (x86)\Skillbrains\lightshot\uninst000.exe" /S

If lightshot is not running, the isntallation of package fails
ERROR: The process "lightshot.exe" not found.

If lightshot is running, the first command terminate it (hoorey)
But the second command for uninstallation fail always

'C:\Program' is not recognized as an internal or external command,
operable program or batch file.
Step failed, error mode is set to StopAsError
Failed to run task 'dvc_task_128bcb9bc20d46678e2'

I need to know

1. How not to be stopped if package installation when app is not running
2. How to uninstall it

Thanks for your help