1. Go to the Mac App Store. 2. Find any App made by Apple 3. Click "More Apps by Apple" 4. Download macOS Sierra
One thing that I don't like is Apple Photos App. I have what I consider to be an ideal system for managing photos, and it is not Apple's app: I set my cellphone to wait until I am back home on wifi and then send new photos and videos to Google Photos, OneDrive, and Dropbox. I love having triple copies of everything.
I am downloading macOS Sierra right now on my old Mac and I hope they have some flexibility for disabling/uninstalling unwanted built-in apps. On 10.11.6 you can't delete Photos app.
edit: I just tried more "calculation style" Siri queries that kicked in Wolfram Alpha, and those results are nice!
EDIT: Found it myself here: https://www.apple.com/macos/how-to-upgrade/#hardware-require...
Does anybody know what is different hardware wise between mid-2009 macbook pro and late-2009 macbook?
The Macbook can run MacOS Sierra, but not the MacBook Pro, but they look the same hardware wise.
Reddit Discussion: https://www.reddit.com/r/osx/comments/4rwwe5/psa_pptp_vpn_su...
Apple Support Article: https://support.apple.com/en-us/HT206844
It isn't that PPTP is very good or even at all secure. It is just that it is completely painless to set up and almost universally supported.
L2TP/IPsec by contrast doesn't traverse NATs well, requires several ports open, and is harder to diagnose when things do go wrong (since it can be on different layers).
OpenVPN is likely the best replacement for PPTP, it just still lacks native support on most major platforms (Windows, MacOS, iOS, Android, etc). You need to install a custom client which adds extra friction to getting it setup.
If Microsoft, Apple, and Google all added native OpenVPN support then PPTP would likely die off much faster than it is.