Brazilian users can’t download 4.4.8 at all through the main website.
The download link is kde.c3sl.ufpr.br/stable/krita/4.4.8/krita-x64-4.4.8-setup.exe
It’s hosted by the Universidade Federal do Paraná (Federal University of Paraná), but it doesn’t seem to have enough bandwidth to handle being a mirror. Perhaps the main website should offer a secondary download link in case the automatic mirror doesn’t work.
Edit: apparently you can get to an alternative download link if you click “having trouble downloading?” in the after-download page, navigate to the 4.4.8 directory, go to the 4.4.8-setup.exe file and, instead of clicking the filename, click “details,” to go a page with a map where you have a list of mirrors and then, instead of clicking the first download link, you click the second download link and then it works.