just get reflected to /g/LTspice whether I use firefox or chrome.?
There are many ways to get those wrong.
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Are you currently logged-in to Groups.io?? If you check the upper right corner, does it show your name there, or does it say "Sign Up" or "Log In"? Did you click on a link to go directly to either of those two URLs?? Or did you start at the group's main webpage (/g/LTspice) and then click "Files" or "Photos" in the left column?? Can you navigate into "Files", and see that the "Temp" folder is there, before clicking it?
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It may be a security thing.
Perhaps.? Was this from your home PC or in a work environment.? It might be firewalls on your end.
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As for the LDMOS model issue, it seems that it is a separate question, yes?? (I've changed the Subject line.)