Check if program is installed if so go to next powershell

Question

I've googled and not found anything useful to me.

I have 4 msi files I want to install but would like to check if some of it is installed on the computer.

Example: check if program 1 is installed, if not install it and go to and install program 2. However if it's not installed, install it and go to program 2 and do the same test there.

Execute-MSI -Action Install -Path "$dirFilesProgram1"
Execute-MSI -Action Install -Path "$dirFilesProgram2"
Execute-MSI -Action Install -Path "$dirFilesProgram3"
Execute-MSI -Action Install -Path "$dirFilesProgram4"

Answer 1

If you know the GUID, you could test path the uninstall key. Also don't forget that if your OS is 64 bit, there will be the same key in WOW6432Node for 32 bit apps.

$uninstallkey = "HKLM:SoftwareMicrosoftWindowsCurrentVersionUninstall"
$uninstall32key = "HKLM:SoftwareWOW6432NodeMicrosoftWindowsCurrentVersionUninstall"
#Example 64-bit app
$app1guid = "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
if (!(Test-Path "$uninstallkey$app1guid)) {Execute-MSI -Action Install -Path "$dirFilesProgram1"}
#Example 32-bit app
$app2guid = "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
if (!(Test-Path "$uninstall32key$app2guid)) {Execute-MSI -Action Install -Path "$dirFilesProgram1"}