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Extract the zip file content after download. Navigate into the directory and COPY the directory name "simpleCAPTCHA" (v1.4.0b above) and paste them into your plugin directory located at "wp-content/plugins". Login to your admin CP and enable the Simple CAPTCHA through plugin tab.

1.5.1b

• Fix display problem in IE.
• Changed CAPTCHA field position to the field after website.

1.5.0b

• Fix display problem in some template.
• Added a note to inform that login user do not need to go through CAPTCHA challenge.
• Remove unnecessary javascripts.

1.4.1b

• Fix redirection problem when entered wrong security code.

1.4.0b

• Fix alignment problem for some theme.
• Fix javascript bug in copying comment button value for some theme.
• Added link to the author website.
• Changed directory name to "simpleCAPTCHA".

1.3.1

• Added dependency checker to make sure GD library is loaded.
• Fix redirection bug if invalid security code is entered.

1.3

• Fixed fill in multiple line comment bug.
• Added notification message to user if javascript is disabled.
• Registered user no longer need to type in security code when posting comments.

1.2

• Fixed captcha image path to absolute path.
• Auto fill in comment fields for wrong captcha.
• Added sin wave distortion to image.

1.2b

• Broken url of image.

1.1

• Minor cleaning of the code.
• Plugin URL changed.

1.1b

• Added reload image button.
• Position the submit button at the end of form.
• Alert message added when user enter wrong code.