Marc

If you're a CIC customer, contact Invision support. If you've got a self-hosted license, you can download 4.5 from the client area.
Since you're adding Commerce, you'll need to redownload the files. More on that here:
Invision doesn't offer a direct download of previous versions and 4.5.1 is the current released version. Support may be able to assist with earlier versions (not sure--I asked the question and never got an answer). If you get an answer on this, please let us know!
Before you upgrade, note that 4.5 is a major shift from 4.4 and customizations will very likely break if they aren't updated for 4.5 (plugins, applications, themes, language packs, etc.)

If its any activity feed you are looking to switch off, you can do this from the module. Take a look at the guide here on module permissions. Its the content discovery module you would remove all the permissions from
 
 

Please submit a ticket and include screenshots of your settings. We can then advise accordingly for you.

Awesome! Thanks for the positive feedback - that's exactly what we wanted to hear! 
I'd love to take credit, but it's definitely not me - it's really a cumulation of an amazing development team, new processes and the addition of @Olivia Clarkto the team last year. I'm extremely proud of everyone at IPS; we're very fortunate! 
Thanks again. 4.5 is the best yet. 🙂 

All I really got to say is IPB knocked this one out of the park. HOMERUN! I better add also I'm also really impressed with low bug count in betas. The dev team is organized better than ever.. It's taken some years to get everything on the track it is but I feel it was well worth it and well worth the wait. Should I be giving @Lindy some credit here?? If I do will @Matt pull the Lindy factor line on me? 🤣 This is really such a well rounded product now all the way around. Great awesome job IPB!
 

I considered starting a rivalry but you all are great as you well know.
Edit: You know if you're my favorite. 😉

Thank you for your kind words, Davy. Always happy to assist where we can 🙂 

Thank you for your kind words, Davy. Always happy to assist where we can 🙂 

Sometimes I feel compelled to speak out with regards to a service, it doesn't happen very often but today I do feel compelled to say something about the support given by Invision.
It's First Class!
I've noticed, over the years, that some users post quite disparaging words for the support given, but I've never experience this myself and I truly believe that you have to give praise where it's due, just as much as you have to voice concerns when things are not going right.
I'd like to say thank you to all of the staff who have dealt with any issues I've raised, but in particular to @Marc Stridgen who has always been professional and always sorted out any issues I raised via ticket in a very speedy, precise and concise way.
It's because of this professionalism that I have and always will use Invision and continue to recommend it to my own clients when I believe it will fulfil their needs.
Thank you guy's and gals, each and every one of you.

There is no direct support for that item specifically, however we do have people who integrate many items themselves. How easy that is will of course depend upon the full instructions provided by post affiliate. That said, your issue will be the PHP version there. The current release does not support anything below PHP 7.1, so if they are insistent on version 5, you could not run it in the same location as your community.