Unchecky shouldn't affect the internet speed. The only internet activity it does is checking for updates once every 24 hours.
Of course, you can uninstall Unchecky and see whether that helps. Then, you could reinstall it if you find out that the issue is unrelated to Unchecky.

Unchecky is designed to prevent installation of potentially unwanted programs by default. I don't see what your suggestion has to do with this goal.

Причина: не используются правила hosts файла.

Не получается воспроизвести.
Можно скриншот?

То, что на скриншоте, называется OpenCandy, и оно блокируется правилами hosts файла.

Не получается воспроизвести.
Можно скриншот?

unchecky_setup.exe -install -path <installation_path> [-lang <unchecky_language>]

Например:

unchecky_setup.exe -install -path "C:\Program Files\Unchecky"

unchecky_setup.exe -install -path <installation_path> [-lang <unchecky_language>]

Например:

unchecky_setup.exe -install -path "C:\Program Files\Unchecky"

Update: closed due to a lack of feedback.

You're the first one to report such an issue.
What browser/operation system are you using?

I disagree. I chose the "correct" option to be on the right because that's how it usually is in installers. The "Next >" button is on the right, and the "< Back" button is on the left.

About shorter code and repetition: I chose to do it this way so that even if you don't read the main text, you understand the decision you make by at least reading the text on the buttons.