Automatically convert xls files to xlsx - excel

Question

I have a software that just allows me to download my data in xls files but I want to use it as an xlsx file.
Currently I have an excel macro when I click on a button it converts all my xls files in xlsx but I want to automate this task so I don't have to open the excel file and click on the button.
I was thinking of a script that start when I log in windows or something like that, and it converts automatically my xls file when I download it. But I'm not very good with scripts so anyone can help me with that ? It's on windows 7 and 10.
Thank you for your help.
Edit:
Here is my Powershell script, now I have to automate it so that it runs automatically when I download a new .xls file, I know I can use the task scheduler but how can I do that automation on en event like adding a new xls file to a folder ? Or maybe we can do it in powershell ?
My script:
$xlFixedFormat = [Microsoft.Office.Interop.Excel.XlFileFormat]::xlOpenXMLWorkbook
write-host $xlFixedFormat
$excel = New-Object -ComObject excel.application
$excel.visible = $false
$folderpath = "C:\Users\Mgtspare\Downloads\"
$filetype ="*xls"
Get-ChildItem -Path $folderpath -Include $filetype -recurse |
ForEach-Object `
{
$path = ($_.fullname).substring(0, ($_.FullName).lastindexOf("."))
"Converting $path"
$workbook = $excel.workbooks.open($_.fullname)
$path += ".xlsx"
$workbook.saveas($path, $xlFixedFormat)
$workbook.close()
remove-item $_.fullname
}
$excel.Quit()
$excel = $null
[gc]::collect()
[gc]::WaitForPendingFinalizers()
UPDATE:
I changed my script to have a new script faster and I put a watcher so I run the script when a new xls file is downloaded, I will use task manager to run this script when I log in windows so it can watch without doing anything.
Here is my new script:
### SET FOLDER TO WATCH + FILES TO WATCH + SUBFOLDERS YES/NO
$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = "C:\Users\Mgtspare\Downloads"
$watcher.Filter = "*.xls"
$watcher.IncludeSubdirectories = $false
$watcher.EnableRaisingEvents = $true
### DEFINE ACTIONS AFTER AN EVENT IS DETECTED
$action = {
$watcher.Path *.xls | rename-item -newname { [io.path]::ChangeExtension($_.name, "xlsx") }
}
### DECIDE WHICH EVENTS SHOULD BE WATCHED
Register-ObjectEvent $watcher "Created" -Action $action
while ($true) {sleep 5}
Issue:
My script run in the ISE but when i want to run it in cmd or with the right click on my script file and run with with powershell I have this issue
You must provide a value expression on the right-hand side of the '*' operator.

Answer 1

The below script automatically runs each morning with Task Manager
### SET FOLDER TO WATCH + FILES TO WATCH + SUBFOLDERS YES/NO
$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = "C:\Users\Mgtspare\Downloads"
#$watcher.Filter = "*.*"
$watcher.IncludeSubdirectories = $true
$watcher.EnableRaisingEvents = $true
### DEFINE ACTIONS AFTER AN EVENT IS DETECTED
$action = {
Get-ChildItem -Path C:\Users\Mgtspare\Downloads *.xls | rename-item -newname { [io.path]::ChangeExtension($_.name, "xlsx") }
}
### DECIDE WHICH EVENTS SHOULD BE WATCHED
Register-ObjectEvent $watcher 'Created' -SourceIdentifier 'FileCreated' -Action $action
while ($true) {sleep 1000}