I got it by going to the 'Plugin Boutique' site and adding to the basket from the list (top left).
VST Plugins
You will then be given a code and link to activate at the UAD website. You then download the LA-2A via their UA Connect App.
Authorize Your UAD Plug-Ins
You will also need an iLok account (No USB dongle needed). I just used my iLok Cloud/Computer account.
After linking your iLok account at UAD you will find it just turns up in your iLok account.
I found it to be okay, but certainly no better than my stock vintage Comps/Limiters in Nuendo 12.
Also, I couldn't seem to resize it, although that might be a Nuendo thing.
It does seem an awful lot of faffing around for something that might not be any better than you already have when it comes to *Vintage' sounding VST's.
Please don't let my negativity put you off though. Some may find it really useful !!