The installer prompts for all necessary information, only to stop because of missing admin rights.
This has made me cancel the installation and re-run it with admin rights more than once. I was afraid that [Ignore All] would try to install without admin rights and cause some problems down the road.
I tried [Ignore All] today and was prompted for admin credentials, so the installation was actually fine.
I still find that strategy confusing. Why show that warning and not just have the [Install] button with the admin icon enabled like most other installers?