installing Commerce

[EmpireKicking]

I'm doing this on my test website,

What have I done so fair (seems to be working)
1. uploaded the system files that replaced the old.
2. uploaded nexus in applications

PS, I'm running V4.1.5

Then in ACP applications, I click install the add-on "Commerce" went all good, apart from application is out of date and cannot be enabled until it is upgraded. However I see the settings for the Commerce, and all working good and the store page is up http://www.baysideves.com/TestSite/index.php?/support/ apart from the page error

 

I'm doing this on my test site and what I need above might work for my real deal site, that's still running 4.1.1, I want to know if it's a good idea before I do so.