It’s happened again and I’m angry. Please help!!!!

A few weeks ago I downloaded xammp and wordpress onto my home desktop pc as local host (no webhost). I then uploaded the divi theme with divi builder and everything went ok. It was fully loaded onto my pc with a local host URL. I then turned off my pc and the following day turned on my pc and The local host URL did not load. It was as if I had not downloaded anything.

Yesterday I did the same thing on another of my laptop pc’s. Once again it uploaded fine with a wordpress username etc. At localhost/testsite./wordpress using http; etc and, once again, I get an ‘Unable to connect’ page. Once again it is if it has disappeared completely from my pc.

urls used are -

https://localhost/testsite./wordpress
https://localhost/testsite./wordpress/
https://localhost/testsite./wordpress/wp-admin/

I must have downloaded wordpress etc as my pc told me it had done so –there was a message on my screen telling it had downloaded ok as well as me being able to see it on my home screen.
yesterday I closed the worpress loaded software webpage and reopened it again to see it load again without issue . So, taking that into consideration, where the hell has it gone today ?!.

Is it a case of me not saving the webpage or something yesterday ?.

Can anyone help ?