Unable to complete VIVE setup; stuck at close Steam prompt

[Contra_Shark]

I started by going to https://www.vive.com/au/setup/ and downloading the ViveSetup.exe. I ran ViveSetup.exe and enter the admin's password. I went through the steps of installing VIVEPORT and creating an account. I'm currently stuck at the part where software is installed at C:\Program Files (x86)\VIVE and C:\Program Files (x86)\Steam. The message says 'Close Steam  Confirm that you've closed the Steam client, and then click "Continue" (see image). The Steam client was not running before this message appeared. I tried running, signing into Steam, then closing it (confirmed via Task Manager). I still cannot proceed. The program is ViveInstall.exe and it's running under the admin account.

OS: Windows 10 Version 20H2