The link is still live but they do warn
"
We have no plans to update the Collection or add new features over time." a a
but sometimes plans change - and Google is a business - maybe if they don't want to some other company will buy it from them and take this further.
I am running it on Windows 10 and although it is only listed for up to Windows 8, it does still work well.
It also does not list Corel Paintshop Pro as compatible but it is, works fine within Paintshop.
I'd download and save a copy of the download least that also disappear in time.
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I have picked up a couple over time by Topaz labs (They have been free with purchase of other products in the past).
What other add ins / plug ins do you use / recommend?