After the error message I just posted about, now Studio 2021 isn't opening. Instead it send me to a page here: "404 - Oops, something has gone wrong! We are sorry, but this URL is not available on this website. Please make sure the URL you entered

Studio 2021 suddenly gave me an error message when I tried to open a new document for translation. Then when I tried to re-open Studio, it doesn't open on my laptop, but sends me to SDL website, which gives me an error message: 

404 - Oops, something has gone wrong!

We are sorry, but this URL is not available on this website. Please make sure the URL you entered is correct.

If you are still seeing this error, please use the links below to go to the home page or search the documentation to find what you are looking for.