Fixes

[GUI] Fixed an issue where the sticky keys pop up was not turning off after Clean Windows Explorer was used.
[GUI] Fixed an issue where Snip & Sketch overlay was not opening on pressing Print Screen key after Clean Windows Explorer was used.
Fixed Windows Search was no longer responding properly after Turning off Background apps (thanks to @whyredfire for validating in Semi Annual Channel OS Build 19042)

Changelog

No longer remove Windows Terminal since it has become the default Terminal application in Windows 10 Insider Dev channel OS builds.
Update Windows Package Manager (WinGet) to version 1.0.11451.
No longer remove Internet Explorer since it results in false positive antimalware detection.
Check package checksum of all packages that are required before installing WinGet.
Intelligently install WinGet.
[GUI] Do not let user remove Windows Terminal.
[CLI] Intelligently install 7-zip.
[CLI] Add the classic Windows Photo Viewer desktop app into the list of apps that can open Photos with JPG, JPEG, GIF and PNG extensions.
[CLI] Install HEVC Video Extensions if they're not already installed.
[CLI] Unpin Apps from Taskbar. This is the list:
- Mail
- Microsoft Store
- Office
- Xbox

CleanWin is now compatible with Windows 10 21H1 - May 2021 update.
Displayed user messages are more consistent than ever (thanks @vancelmusic for suggesting).
Improved UX.
Check for internet status on startup.
GUI variant enters Servicing mode, read Release notes below for more info.

Add PowerDownAfterShutDown - this is a simple registry edit to fix an issue where some computers might automatically start up after commencing a shut down.
[CLI] Turn on Storage Sense.
[CLI] Turn on Num lock on startup.

WinGet might produce the following error on installation of apps. Issue filed in CleanWin repo and WinGet CLI repo:

To remedy this, run Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\DoSvc" -Name Start -Type DWord -Value 3 -Force in an elevated PowerShell environment and reboot your PC. If the fix does not seem to work, join the release discussion below and let me know.
Windows 11 only: Apps do not get unpinned from the Start menu: #16 (comment)
Related links: CleanWin issue tracker dashboard and Windows 10 Release health.

GUI uses Windows Forms at its core, which is deprecated tech. Hence, GUI variant enters Servicing channel starting this release. In short, this means that GUI variant will no longer be updated apart unless it needs bug fixes. Hence, users are strongly recommended to switch to CLI variant for a better and updated experience.
As I announce the starting of Servicing channel for GUI variant, I am also looking forward to update GUI to a newer technology (NOT WPF) in a not-so-near future. Suggest your ideas, take a peek here.
Some personal stuff: I'm currently in high school, and by the end of July this year, my final exams will begin. The months that follow will be an academically important period in my life. Hence, I might be unable to regularly update CleanWin for during that time. I'm sorry for any inconvenience that might be caused due to this, and I appreciate your patience. Wish me luck! 😁
This release was tested on Windows 10 Pro Insider Dev Channel - OS Build 21390 and Windows 10 Pro Semi Annual Channel OS Build 19043.685 (Windows 10 21H1 | May 2021 update).

I hope you too love this release of CleanWin as much as I do! ❤️ Stay home and stay safe! 💕