Hello @DCK
Thank you for reaching out on the community and telling us about your issue. From my experience seeing this issue it generally happens when the quicken folder is unable to make any changes in the program (x86) file even when trying manually.I would take a look here at this article here and see if you can install quicken by changing the installation directory. Another thing to note is that if your antivirus also manages any program installations I've also seen that block it previously.
Can you try out changing the installation directory and see if we're able to make any progress.
Thanks,
Quicken Francisco