Unable to Install the Game: "Start Install" Button Greyed out

Dear Everyone and Blizzard team !

I simply cannot press the greyed out “Start Install” Button when trying to install.

the condition:

  1. Recently Update Operating System: Windows 10 Pro 64-bit (10.0, Build 19044) (19041.vb_release.191206-1406)
  2. Processor: Intel(R) Core™ i5-7600K CPU @ 3.80GHz (4 CPUs), ~3.8GHz
  3. Memory: 16384MB RAM
  4. Disk Space: free space more than 800GB SSD
  5. Graphic Card: GTX 1060 6GB
  6. Battle Net Apps, installed on the same disk with the windows
  7. Already Uninstall Battle.Net and install again
  8. i tried uninstall and install diablo 3 & diablo 2 resurrected, but it still not works for diablo 4
  9. I still got the Gift for diablo 3 from purchase diablo 4, (so it means the purchase are successful)
  10. Network Connectivity Issues: my network shouldn’t be issue, i can play Diablo 3 & Diablo 2 Resurrected and its running well
  11. Security software interface: this shouldn’t be issue, i didnt use any antivirus and battlenet apps already on allowed apps firewall. (not for diablo 4 because i even cannot install it yet)
  12. File or directory permissions issues: this shouldn’t be issue, i check none of any apps related to battle.net are read-only

Please Help !.. i bought $99.99 and cannot play !

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