diff --git a/cps/db.py b/cps/db.py
index 6b1d754f..3dd446bc 100644
--- a/cps/db.py
+++ b/cps/db.py
@@ -584,7 +584,7 @@ class CalibreDB():
 
         if not cc_classes:
             try:
-                cc = conn.execute("SELECT id, datatype FROM custom_columns")
+                cc = conn.execute(text("SELECT id, datatype FROM custom_columns"))
                 cls.setup_db_cc_classes(cc)
             except OperationalError as e:
                 log.debug_or_exception(e)
diff --git a/cps/debug_info.py b/cps/debug_info.py
index 8f0cdeee..cfa549f9 100644
--- a/cps/debug_info.py
+++ b/cps/debug_info.py
@@ -29,7 +29,7 @@ except ImportError:
 
 import os
 
-from flask import send_file
+from flask import send_file, __version__
 
 from . import logger, config
 from .about import collect_stats
@@ -43,9 +43,15 @@ def assemble_logfiles(file_name):
         with open(f, 'r') as fd:
             shutil.copyfileobj(fd, wfd)
     wfd.seek(0)
-    return send_file(wfd,
-                     as_attachment=True,
-                     attachment_filename=os.path.basename(file_name))
+    if int(__version__.split('.')[0]) < 2:
+        return send_file(wfd,
+                         as_attachment=True,
+                         attachment_filename=os.path.basename(file_name))
+    else:
+        return send_file(wfd,
+                         as_attachment=True,
+                         download_name=os.path.basename(file_name))
+
 
 def send_debug():
     file_list = glob.glob(logger.get_logfile(config.config_logfile) + '*')
@@ -60,6 +66,11 @@ def send_debug():
         for fp in file_list:
             zf.write(fp, os.path.basename(fp))
     memory_zip.seek(0)
-    return send_file(memory_zip,
-                     as_attachment=True,
-                     attachment_filename="Calibre-Web-debug-pack.zip")
+    if int(__version__.split('.')[0]) < 2:
+        return send_file(memory_zip,
+                         as_attachment=True,
+                         attachment_filename="Calibre-Web-debug-pack.zip")
+    else:
+        return send_file(memory_zip,
+                         as_attachment=True,
+                         download_name="Calibre-Web-debug-pack.zip")
diff --git a/cps/gdriveutils.py b/cps/gdriveutils.py
index 7c8c23b0..c63b0393 100644
--- a/cps/gdriveutils.py
+++ b/cps/gdriveutils.py
@@ -34,6 +34,7 @@ try:
 except ImportError:
     from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.exc import OperationalError, InvalidRequestError
+from sqlalchemy.sql.expression import text
 
 try:
     from apiclient import errors
@@ -168,7 +169,7 @@ class PermissionAdded(Base):
 def migrate():
     if not engine.dialect.has_table(engine.connect(), "permissions_added"):
         PermissionAdded.__table__.create(bind = engine)
-    for sql in session.execute("select sql from sqlite_master where type='table'"):
+    for sql in session.execute(text("select sql from sqlite_master where type='table'")):
         if 'CREATE TABLE gdrive_ids' in sql[0]:
             currUniqueConstraint = 'UNIQUE (gdrive_id)'
             if currUniqueConstraint in sql[0]:
diff --git a/cps/ub.py b/cps/ub.py
index 0d060ed1..c334ff59 100644
--- a/cps/ub.py
+++ b/cps/ub.py
@@ -485,11 +485,12 @@ def migrate_registration_table(engine, session):
 
 
 # Remove login capability of user Guest
-def migrate_guest_password(engine, session):
+def migrate_guest_password(engine):
     try:
         with engine.connect() as conn:
+            trans = conn.begin()
             conn.execute(text("UPDATE user SET password='' where name = 'Guest' and password !=''"))
-        session.commit()
+            trans.commit()
     except exc.OperationalError:
         print('Settings database is not writeable. Exiting...')
         sys.exit(2)
@@ -648,7 +649,7 @@ def migrate_Database(session):
        is None:
         create_anonymous_user(session)
 
-    migrate_guest_password(engine, session)
+    migrate_guest_password(engine)
 
 
 def clean_database(session):
diff --git a/cps/updater.py b/cps/updater.py
index 94cb0453..63ea23bf 100644
--- a/cps/updater.py
+++ b/cps/updater.py
@@ -210,7 +210,7 @@ class Updater(threading.Thread):
     def moveallfiles(cls, root_src_dir, root_dst_dir):
         new_permissions = os.stat(root_dst_dir)
         log.debug('Performing Update on OS-System: %s', sys.platform)
-        change_permissions = (sys.platform == "win32" or sys.platform == "darwin")
+        change_permissions = not (sys.platform == "win32" or sys.platform == "darwin")
         for src_dir, __, files in os.walk(root_src_dir):
             dst_dir = src_dir.replace(root_src_dir, root_dst_dir, 1)
             if not os.path.exists(dst_dir):