Yes you can upgrade to LR 5 directly from any earlier version 1 through 4.
Could one of you let me know which link to access for upgrade purchase?
Am sorry - I could not find the upgrade link at all.
Thank you - in advance.
Thank you - I figured it out.
There is separate tab at the bottom-right corner of the page which says "Lightroom Standalone - Perpetual license" --> Buy Now --> which is the only link which allows one to choose upgrade option.
The "Buy Now" button at the Top-Right corner provides you option of only "Creative Cloud" --> monthly or annual.....