My browser / operating system: Windows 7, Chrome 95.0.4638.69, No Flash versions detected
Screenshot:

Securly issue, not a Scratch issue.

dhuls wrote:

Securly issue, not a Scratch issue.

So how to fix it?

you might of disabled block insecure content which could cause that

The issue is that your computer does not recognize the certification authority we use (Let's Encrypt), likely because their certificate is missing from your root store. There is nothing we can do about this, it is your responsibility to ensure your root store is up to date.

Shall I click that?

vudeptrai090211 wrote:

Shall I click that?

might as well.

jvvg wrote:

it is your responsibility to ensure your root store is up to date.

Well so the OP could probably update their operating system or browser to the latest version to see if it fixes it. They're using Windows 7 so they can't do much anymore, switch to Linux or get Windows 10 or 11 ¯\_(ツ)_/¯

Fixed!