I just installed a fresh Miktex 2.9 in Windows 10 (details attached in fig.)
But it failed to run a tex file having revtex4-1 package and even when I changed the package to revtex4-2, it failed (see revtex4-1.cls not found in miktex2.9 in Windows 7).
I checked whether or not the miktex console is updated and found that 99 updates are pending in the freshly installed miktex (basic-miktex-20.12-x64.exe). I started updating. But at 88% (while installing packages) the miktex updating system failed showing some error message.
Then I thought to start a new installation from scratch. But from the control panel of my windows I could not even start the uninstalling process. I clicked the uninstall button for Miktex, but literally nothing happens. Just nothing. No error window, nothing. (fig attached)
Then, here I found a hint (Uninstalling MiKTeX 2.9):
I suppose you have a standard installation. Go to C:\Program Files\MiKTeX 2.9\miktex\bin\x64\internal. Right-click on uninstall_admin.exe and select Execute as Administrator.
But in my pc uninstall_admin.exe is not present (fig attached).
What should I do? Please help.
Please don't use difficult terminologies, I am a layman in this field.