MacOS Big Sur Installation Failed on MacMini 2018

Today Morning I received MacOS Big Sur update. I was able to download the installer pf 12.18 GB. But when I started installation process. the installation is not working It runs for sometime and then pops-up an error "The request timed out".

Screenshot:

I am also including following logs from /var/log/install.log

2020-11-13 12:07:11+05:30 macmini osinstallersetupd[4954]: Started downloading package com.apple.dmg.BaseSystem (linkfile-validated:///System/Volumes/Data/macOS%20Install%20Data/UpdateBundle/AssetData/Restore/BaseSystem.chunklist:::/System/Volumes/Data/macOS%20Install%20Data/UpdateBundle/AssetData/Restore/BaseSystem.dmg)
2020-11-13 12:07:11+05:30 macmini osinstallersetupd[4954]: Validating asset: /System/Volumes/Data/macOS Install Data/BaseSystem.dmg.partial
2020-11-13 12:07:13+05:30 macmini osinstallersetupd[4954]: Validation passed
2020-11-13 12:07:13+05:30 macmini osinstallersetupd[4954]: Retrieved package com.apple.dmg.BaseSystem (linkfile-validated:///System/Volumes/Data/macOS%20Install%20Data/UpdateBundle/AssetData/Restore/BaseSystem.chunklist:::/System/Volumes/Data/macOS%20Install%20Data/UpdateBundle/AssetData/Restore/BaseSystem.dmg)
2020-11-13 12:07:13+05:30 macmini osinstallersetupd[4954]: Started downloading package com.apple.pkg.BridgeOSBrain (http://swcdn.apple.com/content/downloads/11/17/001-79709-A_O49FG5PSSW/u6bzq2oteumrkby9vik00n7p5qlytdkbn5/BridgeOSBrain.pkg)
2020-11-13 12:07:14+05:30 macmini osinstallersetupd[4954]: Retrieved package com.apple.pkg.BridgeOSBrain (http://swcdn.apple.com/content/downloads/11/17/001-79709-A_O49FG5PSSW/u6bzq2oteumrkby9vik00n7p5qlytdkbn5/BridgeOSBrain.pkg)
2020-11-13 12:07:14+05:30 macmini osinstallersetupd[4954]: Starting bridgeOS update prepare
2020-11-13 12:17:14+05:30 macmini osinstallersetupd[4954]: bridgeOS update prepare timed out!
2020-11-13 12:17:14+05:30 macmini osinstallersetupd[4954]: Operation queue failed with error: Error Domain=com.apple.OSInstallerSetup.error Code=601 "An error occurred installing macOS." UserInfo={NSLocalizedDescription=An error occurred installing macOS., NSLocalizedRecoverySuggestion=The request timed out.}
2020-11-13 12:17:14+05:30 macmini InstallAssistant[4953]: Stopped operation queue with Error Domain=com.apple.OSInstallerSetup.error Code=601 "An error occurred installing macOS." UserInfo={NSLocalizedDescription=An error occurred installing macOS., NSLocalizedRecoverySuggestion=The request timed out.}