Hi, I wanted to upgrade my old v1.18.9 IDE on Windows 10, and downloaded the V2 IDE from Arduino site.
Got a file name unconfirmed_download_blah.
No help whatsoever from Microsoft community. Une suggestion was ‘select ‘properties’ on file and uncheck the unblock box’
No such animal. I plugged an NTFS drive in my pi400, and downloaded the file, after an initial name of ‘unconfirmed-download_blah’ it morphed into an ‘exe’ file.
Transferred drive onto the Win10 machine and installed IDE no problem.

A digression (somewhat)
I have to admit, the win10 machine (AMD board) still works well (apart from the sloooow speed).
But I can now proceed to try out boards that can’t be developed using raspberry pi, who have abandoned dev of the latest family of Arduino boards altogether.

One pi400 has recently ‘bit the dust’ and the Raspbian OS is now a disaster, also including the 64-bit ‘Wayland’ rubbish.
Two Apples I bought in 2012 still work well, if a little slowly, so my next machine will be a new Apple.