Uninstall FluentFlyout along with its certificate.

FluentFlyout-Uninstaller.bat

<# :
@echo off
setlocal enableextensions
:: checks for Administrator rights
:: "net session" depends on Server service, so this method is used instead
reg query HKEY_USERS\S-1-5-19\Environment /v TEMP >nul 2>nul || (
  mshta vbscript:Execute("CreateObject(""Shell.Application"").ShellExecute ""%~f0"", """", """", ""runas"", 1:code close"^)
  goto :eof
)
powershell -NoProfile -NoLogo "iex (${%~f0} | out-string)"
pause
goto :eof
#>
#Requires -RunAsAdministrator
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing

$app = Get-AppxPackage unchihugo.FluentFlyout -AllUsers -ErrorAction Stop
if ($app -eq $null) {
   [Console]::Error.WriteLine("Package not found: unchihugo.FluentFlyout")
   exit 1
} else {
   Write-Output "Found package: unchihugo.FluentFlyout"
}

$form = New-Object System.Windows.Forms.Form
$form.Text = "Uninstall FluentFlyout"
$form.Width = 300
$form.Height = 200
$form.StartPosition = "CenterScreen"
$form.FormBorderStyle = "FixedDialog"
$form.MaximizeBox = $false
$form.MinimizeBox = $false
$form.TopMost = $true

$label1 = New-Object System.Windows.Forms.Label
$label1.Text = "Uninstall FluentFlyout"
$label1.Location = New-Object System.Drawing.Point(20, 20)
$label1.Size = New-Object System.Drawing.Size(250, 30)
$label1.TextAlign = [System.Windows.Forms.HorizontalAlignment]::Center
$form.Controls.Add($label1)

$checkbox1 = New-Object System.Windows.Forms.CheckBox
$checkbox1.Text = "Keep user settings"
$checkbox1.Location = New-Object System.Drawing.Point(20, 60)
$checkbox1.Size = New-Object System.Drawing.Size(250, 30)
$form.Controls.Add($checkbox1)
#checked? : .Checked

$button1 = New-Object System.Windows.Forms.Button
$button1.Text = "OK"
$button1.DialogResult = [System.Windows.Forms.DialogResult]::OK

$button2 = New-Object System.Windows.Forms.Button
$button2.Text = "Cancel"
$button2.DialogResult = [System.Windows.Forms.DialogResult]::Cancel

$flowLayoutPanel1 = New-Object System.Windows.Forms.FlowLayoutPanel
$flowLayoutPanel1.Controls.Add($button2)
$flowLayoutPanel1.Controls.Add($button1)
$flowLayoutPanel1.FlowDirection = [System.Windows.Forms.FlowDirection]::RightToLeft
$flowLayoutPanel1.Size = New-Object System.Drawing.Size(($button1.Width + $button2.Width), ($button1.Height + 10))
$flowLayoutPanel1.Dock = [System.Windows.Forms.DockStyle]::Bottom
$form.Controls.Add($flowLayoutPanel1)

Write-Output "A window has appeared."

$form.AcceptButton = $button1
$form.CancelButton = $button2

$result = $form.ShowDialog()

if ($result -ne [System.Windows.Forms.DialogResult]::OK) { exit 1 }
$form.Dispose()

$loc = $app.InstallLocation

Write-Output "Stopping FluentFlyout process..."
$process = Get-Process FluentFlyout -ea SilentlyContinue
if ($process -ne $null) { $process | Stop-Process }

Write-Output "Removing package..."
$CanRemoveCert = $true
$certPath = Join-Path $loc "AppxSignature.p7x"
$thumb = [System.Security.Cryptography.X509Certificates.X509Certificate2]::new($certPath).thumbprint
# Check error condition
if ($? -eq $false) {
    [Console]::Error.WriteLine("Can't find certificate at: $certPath")
    $CanRemoveCert = $false
}
$app | Remove-AppxPackage -AllUsers -ErrorAction Stop

# Microsoft Store may have removed certificate and user data, so non-terminating errors could occur

if ($CanRemoveCert) {
    Write-Output "Removing associated certificate..."
    Remove-Item Cert:\LocalMachine\TrustedPeople\$thumb
}

# If not "Keep user settings"
if (-not $checkbox1.Checked) {
    Write-Output "Removing user data (requested)..."
    if ($app.SignatureKind -eq "Store") {
        $userPath = [environment]::GetFolderPath("LocalApplicationData") + "\Packages\$($app.PackageFamilyName)"
    } else {
        $userPath = [environment]::GetFolderPath("ApplicationData") + "\FluentFlyout"
    }
    Remove-Item -Recurse -Force $userPath
}