I have now tried to follow the link from my product page for my V-collection 3. The page for the link have all the applications from V-Collection 3 except Analog Laboratory and Spark WDM.
On this page you can find Spark WDM too still:
https://www.arturia.com/support/updates&manualsIf you see under the applications then you find the new V-Collection 5 versions and then older versions. There is also an archieve button for each application.
The older versions i believe is for both V-Collection 3 and 4.
The old versions for the applications included in V-Collection 3 i believe you can download and use.
As Spark WDM and Analog Laboratory is discontinuet products, then they need the old E-Licenser activation, but the other applications can be activated thru Arturia Software Center (ASC). I can't remember how, but i now also have my old V-Collection 3 in ASC like mentioned.
I don't know why the last versio of Analog Laboratory is'nt to be found on the download page.
In V-Collection 4 Spark VDM was included in Spark 2. And in V-Collection 5 Spark is'nt included, and i think it will be discontinuet.
To be sure about this and what to do, you might need to contact Arturia Support.