This version replace BuildVersion(0.0.x.0) of AppManifest with VSTS BuildID. original : https://gist.github.com/ridomin/7250c9fb3fbc74593c7f97520a3fe771

ReplacePackageAppxManifest.ps1

$env:UWPOutputPath = "./UWP"
$env:BUILD_BUILDID = 0
$env:EnableSideload = "true"

$enableSideload = [bool]::Parse($env:EnableSideload)
$manifestVersionRegex = " Version=""\d+\.\d+\.\d+\.\d+"""
$versionRegex = "\d+\.\d+\.\d+\.\d+"
$manifestFiles = Get-ChildItem -LiteralPath $env:UWPOutputPath -Recurse -Filter "Package.appxmanifest" 

foreach ($file in $manifestFiles){
    $content = Get-Content $file.FullName -Encoding utf8
    if (($content | where {$_ -match $manifestVersionRegex}) -and ($Matches[0] -match $versionRegex)) {
        $currentVersion = [version]$Matches[0]
        $newVersion = if ($enableSideload){ "{0}.{1}.{2}.{3}" -f $currentVersion.Major, $currentVersion.Minor, $env:BUILD_BUILDID, 0 }else{ $currentVersion.ToString() }
        $manifestVersion = " Version=""$newVersion"""
    }
    if ($enableSideload){ $content -replace $manifestVersionRegex, $manifestVersion | Out-File $file.FullName -Encoding utf8 }
    Write-Host ("##vso[task.setvariable variable=AppxVersion;]$newVersion") 
}