Run Down Installer for PocketMine-MP (PowerShell).

Run Down PocketMine Installer.ps1

$host.ui.RawUI.WindowTitle = "Run Down PocketMine-MP Installer"
$WebClient = New-Object System.Net.WebClient

# Setting this to true will delete all files in the current directory.
# Setting this to false will replace specific files in the current directory with the latest versions.
$global:FreshInstallMode = $false

# Change this to the version of PHP and PocketMine-MP you want to install.
$global:PHPVer = "8.2-latest"
$global:PMMPVer = "PM5"

if ($global:PMMPVer -eq "PM6") {
	$global:PMMPURL = "https://update.pmmp.io/api?channel=alpha"
}
elseif ($global:PMMPVer -eq "PM5") {
	$global:PMMPURL = "https://update.pmmp.io/api?channel=5"
}
elseif ($global:PMMPVer -eq "PM4") {
	$global:PMMPURL = "https://update.pmmp.io/api?channel=4"
} else {
	$global:PMMPURL = "https://update.pmmp.io/api?channel=stable"
}

function Pre-Script {
	Splash-Text
	Write-Host "Run Down PocketMine-MP Installer:" -foreground "Magenta" -NoNewline; Write-Host " Made by HBIDamian" -foreground "DarkCyan"
	Write-Host "This is a very hacky way of installing PocketMine-MP." -foreground "DarkMagenta"
	Write-Host "It's not really recommended to use it for production." -foreground "DarkRed"
	Write-Host ""
	if ($global:FreshInstallMode -eq $true) {
		Write-Host "FreshInstallMode:" -foreground "White" -NoNewline; Write-Host " True" -foreground "Yellow"
	} else {
		Write-Host "FreshInstallMode:" -foreground "White" -NoNewline; Write-Host " False" -foreground "DarkYellow"
	}
	Read-Host -Prompt "Press Enter to continue"
	clear-host
	Start-Script
}

function Splash-Text {
	Write-Host "   _____________________  ________    " -foreground "Red"
	Write-Host "   | ___ \  _  \ ___ \  \/  |_   _|   " -foreground "DarkYellow"
	Write-Host "   | |_/ / | | | |_/ / .  . | | |     " -foreground "Yellow"
	Write-Host "   |    /| | | |  __/| |\/| | | |     " -foreground "Green"
	Write-Host "   | |\ \| |/ /| |   | |  | |_| |_    " -foreground "DarkCyan"
	Write-Host "   \_| \_|___/ \_|   \_|  |_/\___/    " -foreground "Magenta"
	Write-Host ""
}

function Get-Time-Stamp {
	Write-Host "[$((Get-Date -Format 'HH:mm:ss:fff'))] " -foreground "White" -NoNewline
}

function Download-File {
	param(
		[string]$url,
		[string]$destination
	)
	Get-Time-Stamp; Write-Host "[INFO]: Downloading $url..." -foreground "Cyan"
	$WebClient.DownloadFile($url, $destination)
	if (!(Test-Path $destination)) {
		Get-Time-Stamp; Write-Warning "[ERROR]: Absent File: $destination. Aborting." -foreground "Red"
		Read-Host -Prompt "Press Enter to exit"
		exit
	} else {
		Get-Time-Stamp; Write-Host "[SUCCESS]: Downloaded $destination" -foreground "Green"
	}
}

function Start-Script {
	Splash-Text
	Get-Time-Stamp; Write-Host "[INFO]: Detecting and killing active PocketMine-MP Servers" -foreground "Cyan"
	$PMMPProcess = Get-Process -Name "php" -ErrorAction SilentlyContinue
	if ($PMMPProcess) {
		$PMMPProcess | Stop-Process -Force -ErrorAction SilentlyContinue
		$PMMPProcess.WaitForExit()		
		Get-Time-Stamp; Write-Host "[SUCCESS]: Killed any running PocketMine-MP servers." -foreground "Green"
	} else {
		Get-Time-Stamp; Write-Host "[INFO]: No PocketMine-MP servers running." -foreground "Cyan"
	}
	if ($global:FreshInstallMode -eq $true) {
		try {
			Get-Time-Stamp; Write-Host "[INFO]: Removing all files in current directory..." -foreground "Cyan"
			$ScriptName = $MyInvocation.ScriptName.Split("\")[-1]
			Get-ChildItem -Path .\ -Exclude $ScriptName | Remove-Item -Recurse -Force -ErrorAction Stop
			Get-Time-Stamp; Write-Host "[SUCCESS]: All Files removed successfully." -foreground "Green"
		} catch {
			Get-Time-Stamp; Write-Host "[ERROR]: An error occurred: $($_.Exception.Message)" -foreground "Red"
		}
	} else {
		try {
			Get-Time-Stamp; Write-Host "[INFO]: Removing specific files in current directory..." -foreground "Cyan"
			Remove-Item -Path .\bin -Recurse -Force -ErrorAction Stop
			Remove-Item -Path .\vc_redist.x64.exe -Force -ErrorAction Stop
			Remove-Item -Path .\PocketMine-MP.phar -Force -ErrorAction Stop
			Remove-Item -Path .\start.cmd -Force -ErrorAction Stop
			Remove-Item -Path .\start.ps1 -Force -ErrorAction Stop
			Get-Time-Stamp; Write-Host "[SUCCESS]: Files removed successfully." -foreground "Green"
		} catch {
			Get-Time-Stamp; Write-Host "[ERROR]: An error occurred: $($_.Exception.Message)" -foreground "Red"
		}
	}

	Get-Time-Stamp; Write-Host "[INFO]: Downloading Binary files..." -foreground "Cyan"
	Download-File -url "https://github.com/pmmp/PHP-Binaries/releases/download/php-$($global:PHPVer)/PHP-Windows-x64-$($global:PMMPVer).zip" -destination "./PHP-$($global:PHPVer)-Windows-x64-$($global:PMMPVer).zip"
	Get-Time-Stamp; Write-Host "[INFO]: Expanding the archive..." -foreground "Cyan"
	Expand-Archive "./PHP-$($global:PHPVer)-Windows-x64-$($global:PMMPVer).zip" -DestinationPath ./
	Get-Time-Stamp; Write-Host "[INFO]: Removing the archive..." -foreground "Cyan"
	remove-Item "./PHP-$($global:PHPVer)-Windows-x64-$($global:PMMPVer).zip"
	Get-Time-Stamp; Write-Host "[INFO]: Checking if php.exe exists from archive..." -foreground "Cyan"
	if (!(Test-Path "./bin/php/php.exe")) {
		Write-Warning "[ERROR]: Absent File. Aborting." -foreground "Red"
		Read-Host -Prompt "Press Enter to exit"
		exit
	}
	Get-Time-Stamp; Write-Host "[INFO]: Downloading latest PocketMine-MP.phar..." -foreground "Cyan"
	$getPhar = Invoke-RestMethod $global:PMMPURL
	Download-File -url $getPhar.download_url -destination "./PocketMine-MP.phar"
	Download-File -url "https://raw.githubusercontent.com/pmmp/PocketMine-MP/stable/start.cmd" -destination "./start.cmd"
	Download-File -url "https://raw.githubusercontent.com/pmmp/PocketMine-MP/stable/start.ps1" -destination "./start.ps1"
	Get-Time-Stamp; Write-Host "[SUCCESS]: Install Complete. You may now use 'start.cmd' or 'start.ps1'" -foreground "Green"
	Write-Host ""
	powershell.exe .\start.ps1
	Read-Host -Prompt "Press Enter to exit"
}
Pre-Script

I changed the name, and made it more cancerous. :D
I also realise it doesn't display the "custom errors" properly. Good. :D

Updated.

• Made it more readable
• Made it easily editable (with global variables)

Note: When PM5 is released, it may not install the stable version and may require an update to the script.

Updated

• Rest in piece, Jenkins. Everyone's favourite butler.

Updated

• Added this.

# Setting this to true will delete all files in the current directory.
# Setting this to false will replace specific files in the current directory with the latest versions.
$global:FreshInstallMode = $false

Makes it easier for testing shit.

• Less green. Green is for success. Cyan is for info.

Updated again: Changelog: