Check if program is installed if so go to next powershell - 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 "$dirFiles\Program1"
Execute-MSI -Action Install -Path "$dirFiles\Program2"
Execute-MSI -Action Install -Path "$dirFiles\Program3"
Execute-MSI -Action Install -Path "$dirFiles\Program4"

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:\Software\Microsoft\Windows\CurrentVersion\Uninstall\"
$uninstall32key = "HKLM:\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\"
#Example 64-bit app
$app1guid = "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
if (!(Test-Path "$uninstallkey\$app1guid)) {Execute-MSI -Action Install -Path "$dirFiles\Program1"}
#Example 32-bit app
$app2guid = "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
if (!(Test-Path "$uninstall32key\$app2guid)) {Execute-MSI -Action Install -Path "$dirFiles\Program1"}

Answer 2

Without knowing anything about your applications, there are two easy options I can think of.
1) Read a log file, looking for a pattern / string - check 6 times (configure as needed) and fail if it doesn't complete. If it does, move on to the next install and do the same check
$LOGFILE = 'C:\Somewhere.log'
$Complete = 'no'
$Counter = 1
$max = 6
Start-Sleep 10
DO {
$Check = SELECT-STRING -pattern 'status: 0.' -path $logfile -quiet
write-host $Check
If (($Check) -eq $True) {
Set-Variable -name Complete -Value "yes"
}
Else {Set-Variable -name Complete -Value 'no'}
Write-host $Counter
Start-Sleep 20
$Counter++
}
while ($Complete -eq 'no')
If (($Counter) -eq $max) {
Throw 'Installation failed, check the error log'
}
Option 2)
If you know what directories it creates or even a file count, can do something like the above with count instead of a file read
$PRDIR = "D:\Folder"
If (($PRDIR.Count) -gt 2)
{
Do something
}
Else
{
Do something else
{
Hope that helps!
R

Answer 3

You can use WMI to check if your MSIs are installed or not. Example:
$products = Get-WmiObject -Class win32_product | Where-Object { $_.Name -like "*someName*" } | Select-Object *
You might extend the Where-Object clause with additional patterns to query for (e.g. via $_.Name -like "*Sw1*" -or $_.Name -like "*Sw2*" ). $products should be an array including the findings, which you can use to check if the requested SW is installed or not. Example:
PS> $found = $results.Where({ $_.Name -like "*sw1*"})
PS> if ($found) { Write-Host "Found" }
Hope that helps