CSS HTML Validator for Personal, Non-commercial Use is a FREE older version that is licensed only for personal, non-commercial use. Download this free version here.
After downloading, run the setup installer and answer Yes to the User Account Control prompt then follow the simple installation instructions. The setup program is digitally signed by AI Internet Solutions LLC (do not run it if it is not).
IMPORTANT: On some systems it may take 1 to 2 minutes for the User Account Control dialog to appear because the system is checking the file.
If the User Account Control dialog does not appear or you get an error message like "Error 5: Access is denied." then please try one or more of the following:
Run the setup program by right-clicking on it and choosing Run as administrator.
Temporarily disable any security software like anti-virus and anti-spyware (it may be preventing the setup program from running).