GUI for my auto installer keeps going blank - powershell

Question

I am currently working on an auto installer for newly configured computers where I work. It has a GUI which allows you to choose which programs will be installed. When the file paths are correct the GUI is blank but when I purposefully mess up the file paths the checkboxes will pop back up.
Sorry if this seems like a very dumb question. I am extremely new to this and have gotten a lot of help from various different websites. This is basically me working off of another auto installer script that I found on this website.
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.Application]::EnableVisualStyles()
$Form = New-Object System.Windows.Forms.Form
$Form.Size = New-Object System.Drawing.Size(600,700)
$Form.text ="Software Installer"
############################################## Start group boxes
$groupBox = New-Object System.Windows.Forms.GroupBox
$groupBox.Location = New-Object System.Drawing.Size (10,20)
$groupBox.text = "Available Software to Install:"
$Form.Controls.Add($groupBox)
$Checkboxes += New-Object System.Windows.Forms.CheckBox
$Checkboxes = New-Object System.Drawing.Size (10,20)
$Button1 = New-Object System.Windows.Forms.Button
$Button1.text = "Install"
$Button1.width = 100
$Button1.height = 30
$Button1.location = New-Object System.Drawing.Point(245,585)
$Button1.Font = 'Microsoft Sans Serif,10'
$apps = [PSCustomObject]#{
Name = ''
Path = ''
PreTransfer = ''
}
$apps = Import-Csv -Path C:\Users\Zach\Desktop\Installers\appslist.csv
$groupBox.Controls.Add($Button1)
$Checkboxes = #()
$y = 20
foreach ($a in $apps)
{
$Checkbox = New-Object System.Windows.Forms.CheckBox
$Checkbox.name = $a.Name
$Checkbox.Text = $a.Name
$Checkbox.Location = New-Object System.Drawing.Size(10,$y)
$y += 30
$groupBox.Controls.Add($Checkbox)
$Checkboxes += $Checkbox
}
$groupbox.size = New-Object System.Drawing.Size(564,(624*$checkboxes.Count))
#to look at each box
$Button1.Add_Click({
foreach ($i in $Checkboxes){
if ($i.checked -eq $true) {
Start-Process $i.AccessibleDescription
}
}
})
$form.ShowDialog()| Out-Null