Get-Package - PS CORE no longer provides installed software - powershell

Question

I'm moving a yaml pipeline so it uses PS Core. One of the steps is to parse currently installed software and uninstall it if it exists:
$appsToUninstall = Get-Package -Provider Programs -IncludeWindowsInstaller -name "*$Instance*"
if ($appsToUninstall.count -gt 0)
{
Get-Service | Where-Object { $_.Name -match "$Instance" } | Stop-Service
$appsToUninstall | Uninstall-Package -Force -Verbose
Write-Output "Uninstalled $Instance"
}
else
{
Write-Warning "Nothing to uninstall! Could not locate $Instance as an installed instance. Continuing as usual."
}
However, it would seem that the new Get-Package - no longer provides installed software.
Is there any way to use native cmdlets (not CMI/WMI [wmi is deprecated!]) to achieve that in the new PS 7+?

Answer 1

You can parse the registry to achieve this :
$Instance = "MyAppToUninstall"
# Initialize array to avoid errors on 32 bits applications addition
[array]$appsToUninstall = #()
# Get 64 bits programs
$appsToUninstall = Get-ItemProperty `
HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* |
Select DisplayName, UninstallString |
Where { $_.DisplayName -like "*$Instance*" }
# Add 32 bits programs
$appsToUninstall += Get-ItemProperty `
HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* |
Select DisplayName, UninstallString |
Where { $_.DisplayName -like "*$Instance*" }
if ($appsToUninstall.count -gt 0)
{
Get-Service | Where-Object { $_.Name -match "$Instance" } | Stop-Service
$appsToUninstall | ForEach-Object {
$app = $_.UninstallString.Substring(0, $_.UninstallString.IndexOf(".exe") + 4)
$arguments = $_.UninstallString.Substring($_.Uninstallstring.IndexOf(".exe") + 5)
if ($app -match "(?i)msiexec")
{
# if MSI package, replace /i parameter by /x to uninstall and
# add /passive parameter to automate the uninstallation
$arguments = "$($arguments.Replace("/I", "/x", [system.StringComparison]::InvariantCultureIgnoreCase)) /passive"
}
Start-Process -FilePath $app -ArgumentList $arguments
}
Write-Output "Uninstalled $Instance"
}
else
{
Write-Warning "Nothing to uninstall! Could not locate $Instance as an installed instance. Continuing as usual."
}
I hope this helps :)