Disable Downloading Cached FTP File - vba

Question

I've got a PowerShell script that I call from VBA using Excel. The script uses WinSCP to download some datetime-named FTP and SFTP files and saves them with a static filename, overwriting the old file, on a network drive location.
The script works on first run, but after that it loads the same cached version of the file. The workaround is to change the cache settings in IE to check for newer versions of stored webpages 'every time I visit the webpage'.
The macro is used by several people and is accessed using a variety of computers. Is there a way around this that I can incorporate in my code, either in VBA or PS so they don't have to remember to go into IE to change their settings?
Script is called from VBA:
Call Shell("powershell -executionpolicy bypass & ""H:\FTP\FTP.ps1""", vbHide)
Script:
try
{
# Load WinSCP .NET assembly
Add-Type -Path "C:\Program Files (x86)\WinSCP\WinSCPnet.dll"
$localPath = "H:\Worksheets\FTP"
$remotePath = "/outgoing/data/LatestData/"
# Setup session options
$sessionOptions = New-Object WinSCP.SessionOptions
$sessionOptions.Protocol = [WinSCP.Protocol]::ftp
$sessionOptions.HostName =
$sessionOptions.UserName =
$sessionOptions.Password =
$session = New-Object WinSCP.Session
try
{
# Connect
$session.Open($sessionOptions)
# Get list of files in the directory
$directoryInfo = $session.ListDirectory($remotePath)
# Select the most recent file
$latest = $directoryInfo.Files |
Where-Object { -Not $_.IsDirectory} |
Where-Object {
[System.IO.Path]::GetExtension($_.Name) -eq ".nc1" -or
[System.IO.Path]::GetExtension($_.Name) -eq ".ky1" -or
[System.IO.Path]::GetExtension($_.Name) -like ".tn*" }
Group-Object { [System.IO.Path]::GetExtension($_.Name) } |
ForEach-Object{
$_.Group | Sort-Object LastWriteTime -Descending | Select -First 1
}
$extension = [System.IO.Path]::GetExtension($latest.Name)
"GetExtension('{0}') returns '{1}'" -f $fileName, $extension
if ($latest -eq $Null)
{
Write-Host "No file found"
exit 1
}
$latest | ForEach-Object{
$extension = ([System.IO.Path]::GetExtension($_.Name)).Trim(".")
$session.GetFiles($session.EscapeFileMask($remotePath + $_.Name), "$localPath\$extension.txt" ).Check()
}
$stamp = $(Get-Date -f "yyyy-MM-dd-HHmm")
$filename = $stamp.subString(0,$stamp.length-6)
$session.GetFiles(
($remotePath + $fileName),
($localPath + $fileName + "." + $stamp)).Check()
}
finally
{
# Disconnect, clean up
$session.Dispose()
}
exit 0
}
catch [Exception]
{
Write-Host $_.Exception.Message
exit 1
}