Update variables dict instead of replacing it

setup.py

@@ -13,7 +13,7 @@ variables = {
 if isfile(makepath(programfiles32,'wapt','private','symetric.txt')) and isfile(makepath(programfiles32,'wapt','private','variables.txt')):
     print('Reading local encrypted variables file')
     f = Fernet(open(makepath(programfiles32,'wapt','private','symetric.txt'),'r').read())
-    variables = json.loads(f.decrypt(open(makepath(programfiles32,'wapt','private','variables.txt'),'r').read()))
+    variables.update(json.loads(f.decrypt(open(makepath(programfiles32,'wapt','private','variables.txt'),'r').read())))
 
 def install():
     parameters = '/S /acceptlicense /server="%s" /execmode=service /runnow' % (','.join(variables['fusinv_servers']))