Hey guys, looking for some help

My laptop has been playing up and have had to do a couple of system restores to get it back to the way it was

Good news is now its fixed but I have lost my Office which was installed

I downloaded it through the office website and have lost my Key to re install it

I have installed it before by logging into the office website and it shows me what I have purchased from them

I cant find the link to see what I have purchased so any help would be appreciated