Python: Threading is not functioning when starting class methods

The problem was the fact that every time it checked the current downloaded data to the data that needed to be downloaded, it never updated the variables. So when the loop came around, it was comparing the same numbers until something. It was stuck in this loop and when something caused it to exit, I'm not sure what, it continued to the next line of code printing that it was finished downloading.

import urllib.request
import urllib
import shutil
import os
import os.path
import sys
import time
import threading

class downloadFile:

    def __init__(self, downloadLink, downloadPath, onDiskName):
        self.downloadSize = urllib.request.urlopen(downloadLink).length
        self.downloadLink = downloadLink
        self.downloadPath = downloadPath
        self.onDiskName = onDiskName
        self.hardPath = os.path.join(self.downloadPath, self.onDiskName)

    def returnMode(self, returnMode = 'stats'):
        if returnMode == 'stats':
            return [self.downloadLink, self.downloadPath, self.onDiskName, self.downloadSize]
        elif returnMode == 'printedStats':
            print('self.downloadLink = ' + self.downloadLink)
            print('self.downloadPath = ' + self.downloadPath)
            print('self.onDiskName = ' + self.onDiskName)
            print('self.downloadSize = ' + self.downloadSize)
            print('self.hardPath = ' + self.hardPath)
            return [self.downloadLink, self.downloadPath, self.onDiskName, self.downloadSize, self.hardPath]

    def executeDownload(self):
        self.downloadStart = time.strftime("[%H:%M:%S] ")
        with urllib.request.urlopen(self.downloadLink) as response, open(self.hardPath, 'wb') as currentFile:
            shutil.copyfileobj(response, currentFile)
        currentFile.close()
        self.downloadEnd = time.strftime("[%H:%M:%S] ")

    def downloadStats(self):
        currentFileSize = os.path.getsize(self.hardPath)
        percentManifested = int(currentFileSize/(self.downloadSize/100))
        return [currentFileSize, percentManifested]

    def liveDownloadStats(self):
        if os.path.isfile(self.hardPath) == False:
            time.sleep(1)
        statList = self.downloadStats()
        while statList[0] < self.downloadSize:
            sys.stdout.write("\r" + self.downloadStart + " Downloading {0}... ".format(self.onDiskName) + "[{0}%]".format(statList[1]))
            sys.stdout.flush()
            statList = self.downloadStats() #This is the extra line of code used to update the variable before comparing on the next while loop.
        sys.stdout.write("\r" + self.downloadStart + " Downloading {0}... ".format(self.onDiskName) + "[{0}%]".format(statList[1]))
        sys.stdout.write("\n")

def Main():
    server = downloadFile("https://s3.amazonaws.com/Minecraft.Download/versions/1.8/minecraft_server.1.8.jar", "C:/Users/my-username/Desktop/", "minecraftServer.jar")
    t1 = threading.Thread(target=server.executeDownload, args=())
    t2 = threading.Thread(target=server.liveDownloadStats, args=())
    t1.start()
    t2.start()

if __name__ == "__main__":
    Main()