cs5.5 master collection serial number for mac

Greeting

Thanks for replying. I must not be explaining myself well.

I originally purchased the Master Suite CS5 with two

system installations. At the time I had a PC and was

going to purchase a Mac. This didn't happen until

this month when I finally purchased a MacPro.

I explained this to the support help and when I

received the original DVDs, the installations were only

for PC.

A few days ago I installed the Master Collection on the MacPro. Upon

completion a serial number was requested. I entered

the number and it was of course not valid.

I installed it as a trial version.

I went through many errors and requests.

Error: "install" can't be opened because it is from an unidentified developer.

The one problem that had me going around was the request to:

"Please close all of the following applications to continue:

Safari Notifications kept on the desktop. The request was to turn

off notifications for an application.

Eventually I used the help menu and used the system preferences which removed the applications

except one: Safari Notifications.

Eventually, I was helped by a tech who said you have to use the ACTIVITY MONITOR.

Please advise with this new information.  Thank You for your help and consideration

because I am new to this new machine. But, so far I am happy that I finally made

this purchase. It's pricey, but most people use the Mac.

I am hoping this assists with my career change.

Frank