I have those messages also, as do a lot of other people. You do not really need to worry about those. They don't really effect the running of your IPS community. I have never had an issue with either of these notices. I just close them off myself, as do many others.
As for your install on 4.4, what version of PHP are you running on your site? If you are running below 7.1 you will run into issues. It is best to have 7.2, but will also run on 7.1 as some servers won't allow the install correctly on 7.2.