I received a notice to update Adobe Flash on my Apple. The source is http://www.getsoft4wer.com. The update window offers no option but to continue & has locked up my Safari browser. Force Quit and shut down don't help, as the update notice reappears as soon as I restart Safari. Is this a legit update, or something malicious?
That is not an update from Adobe and appears your system may have some kind of infection or you have visited a malicious website. I visited the website and it doesn't contain any information on Flash Player installation. If you get this pop-up again it'd be great if you could get a screenshot of the pop-up (see How to take a screenshot on your Mac - Apple Support) and post it here. Adobe does actively go after these malicious sites/users, but we need more information to do so.
The only legitimate place to obtain Flash Player from is get.adobe.com/flashplayer. Any other site cannot be trusted.