Sophos:

$ProgressPreference = "SilentlyContinue"
$Link = "https://download.sophos.com/tools/SophosZap.exe"
$Path = "C:\Users\Public\Downloads"
$File = "SophosZap.exe"
Invoke-WebRequest -Uri $Link -OutFile $Path\$File -UseBasicParsing
Start-Process -FilePath $Path\$File -ArgumentList "--confirm" -Wait

Bitdefender:

$ProgressPreference = "SilentlyContinue"
$Password = "your_plain_text_password"
$Link = "https://download.bitdefender.com/SMB/Hydra/release/bst_win/uninstallTool/BEST_uninstallTool.exe"
$Path = "C:\Users\Public\Downloads"
$File = "BEST_uninstallTool.exe"
Invoke-WebRequest -Uri $Link -OutFile $Path\$File -UseBasicParsing
Start-Process -FilePath $Path\$File -ArgumentList "/bdparams /password=$Password /log" -Wait