arcInstaller.ps1

# Create a temporary directory if it doesn't exist
$tempDirectory = "C:\Temp"
if (-not (Test-Path $tempDirectory -PathType Container)) {
    New-Item -ItemType Directory -Path $tempDirectory -Force
}

# Step 0: Backup Arc:
Write-Host "Backing up arc..."

& "C:\Program Files\7-Zip\7z.exe" a -t7z "c:\Temp\arcBackup.7z" "c:\arcBrowser\*" -mx=4
Write-Host "...Done"

# Step 1: Download the .appinstaller file
$appInstallerUrl = "https://releases.arc.net/windows/prod/Arc.appinstaller"
$appInstallerPath = "C:\Temp\Arc.appinstaller"
Invoke-WebRequest -Uri $appInstallerUrl -OutFile $appInstallerPath


# Step 2: Parse the .appinstaller file to get the MSIX download URI
[xml]$appInstallerXml = Get-Content $appInstallerPath
$msixDownloadUri = $appInstallerXml.AppInstaller.MainPackage.Uri

# Step 3: Download the MSIX file
$msixPath = "C:\Temp\Arc.x64.msix"
Invoke-WebRequest -Uri $msixDownloadUri -OutFile $msixPath

& "C:\Program Files\7-Zip\7z.exe" x "C:\Temp\Arc.x64.msix" -o"c:\arcBrowser" -y


# Cleanup: Remove temporary files
Remove-Item $appInstallerPath
Remove-Item $msixPath

Write-Host "Arc Browser has been downloaded and extracted to $extractPath"

Is it possible to use this script to dowload old Arc's versions?

Not with this script, and all the old versions are gone or at least not easily accessible by now.

But if you wanted to be a hero and save all future versions, you could write a cronjob or run a script on a timer. You would need to hit up "https://releases.arc.net/windows/prod/Arc.appinstaller" at least once a day to get the downloadURI from the xml file. You'd have to then download each new version. And maybe upload them to the internet archive or somewhere that other people can access them.