for all license problems it is helpful to contact the official Steinberg support, which you may access using your "MySteinberg" profile easly.
To make it short for you: You'll only get (official) download locations for already registered (and activated) products (matching version number and size: le/elements/full) as soon they're discontinued. You may tried it on your own too, but that's what I'm told yet.
When you're going to upgrade to Wavelab Elements 8, your LOST und NON-REGISTERED Wavelab LE 6 is not helpful AFAIK:http://www.steinberg.net/en/shop/buy_product/product/wavelab-elements-8.html
You may get the recent KEYS Special Mag 02/2013 (about 15 EUR) which contains the current Wavelab LE 8, which you may upgrade (download only!) to Wavelab 8 Elements for about another 50 EUR, which is locked to a single PC. When you're planing to use it on different PCs at different times you need to spend another 20 EUR for the USB-eLicenser.
Look for "Is it possible to transfer licenses from the Soft-eLicenser to a USB-eLicenser?" at the follwing site under "Soft-eLicenser FAQ":https://www.steinberg.net/en/support/knowledgebase_new.htmlhttps://www.steinberg.net/en/support/knowledgebase_new/show_%20details/kb_show/soft-elicenser-faq/kb_back/2020.html
Find much more details about Wavelab LE 8 in this thread on the KVR-Forum:http://www.kvraudio.com/forum/viewtopic.php?p=5451459#5451459