Nik Collection - Install Problem

Quote:A quick google seems to suggest that Nik Collection 3 or earlier is not compatible with W 11 - you need Nik 4 for that.
That would seem to make sense but personally, I've never been tempted to pay for Nik, so I'm still using the free 'Google' version, trouble free, on Windows 11 but issues like yours do seem to crop up fairly regularly in fora elsewhere.
I did read of one user who had to switch off his AV before Nik would instal and presumably, you'll already have tried installing it as administrator?
Other than that, I'm afraid, I can't help you.

A google search through up a few similar, on other photography forums.
Some list a conflict with Lightroom and a catalogue corruption, a copy and paste;
"I solved the problem. Turns out that Adobe Lightroom had a corrupt catalog. Once I created a new catalog the installation went through without a hitch and worked perfect. Hopefully that helps others who might have the same problem."
However this might be worth a try too.
A microsoft tool to address install issues;
MS Trouble Shooter Download
Some list a conflict with Lightroom and a catalogue corruption, a copy and paste;
"I solved the problem. Turns out that Adobe Lightroom had a corrupt catalog. Once I created a new catalog the installation went through without a hitch and worked perfect. Hopefully that helps others who might have the same problem."
However this might be worth a try too.
A microsoft tool to address install issues;
MS Trouble Shooter Download

UPDATE. DXO have finally solved the problem. This was there suggestion and it worked!
Our team noticed that something was broken with the Visual C++ Redistributable, which prevents Nik from being installed.
We would recommend uninstalling Visual C++ Redistributable, it can be uninstalled via "Programs and Features".
Please search for "Visual C++ Redistributable" and uninstall all items. It shouldn't break your system.
After that please install NikCollectio 4 again - it will try to download and install "Visual C++ Redistributable" properly:
Our team noticed that something was broken with the Visual C++ Redistributable, which prevents Nik from being installed.
We would recommend uninstalling Visual C++ Redistributable, it can be uninstalled via "Programs and Features".
Please search for "Visual C++ Redistributable" and uninstall all items. It shouldn't break your system.
After that please install NikCollectio 4 again - it will try to download and install "Visual C++ Redistributable" properly: