import os
import sys
import re
import stat
import shutil

current_path = os.path.dirname(os.path.abspath(__file__))
root_path = os.path.abspath( os.path.join(current_path, os.pardir))
top_path = os.path.abspath(os.path.join(root_path, os.pardir, os.pardir))

from instances import xlog
import config

def older_or_equal(version, reference_version):
    p = re.compile(r'([0-9]+)\.([0-9]+)\.([0-9]+)')
    m1 = p.match(version)
    m2 = p.match(reference_version)
    v1 = map(int, map(m1.group, [1,2,3]))
    v2 = map(int, map(m2.group, [1,2,3]))
    return v1 <= v2

def run(last_run_version):
    if config.get(["modules", "launcher", "auto_start"], 0):
        import autorun
        autorun.enable()

    shutil.rmtree(os.path.join(top_path, 'launcher')) # launcher is for auto-update from 2.X

    if older_or_equal(last_run_version, '3.0.4'):
        xlog.info("migrating to 3.0.5+")
        for filename in os.listdir(top_path):
            filepath = os.path.join(top_path, filename)
            if os.path.isfile(filepath):
                if sys.platform != 'win32' and filename == 'xxnet':
                    st = os.stat(filepath)
                    os.chmod(filepath, st.st_mode | stat.S_IEXEC)
                if not filename.startswith('.') and filename not in ['README.md', 'xxnet', 'xxnet.bat', 'xxnet.vbs']:
                    os.remove(filepath)
            else:
                if not filename.startswith('.') and filename not in ['code', 'data']:
                    shutil.rmtree(filepath)

@@ -698,16 +698,78 @@
 able()%0A%0A
+    if os.path.isdir(os.path.join(top_path, 'launcher')):%0A    
     shut

Check folder exists before delete