Lightroom 4.1 dowload link

I have my original box with software key but can't find the install disc. My old PC needs a new build on another motherboard, so looking to reisntall 4.1. My current install is at 4.1 with notices to upgrade to 4.4 so it's still supported in some way and works. 

I see links available for the 3.x series of lightroom but none for 4.x. Can I get a link?

Happy to provide install key if needed to verify. 

Thanks,

Dan