Alex
When you get your decoder and open/save the Fall issue (F383), one snafu is that the pdf file (not the website) is what's password protected. So whenever you want to READ an issue, you need to use that issue's code. Kinda PITA.
Of course, one crutch is to save the password in the file name so it's always handy -- e.g., < mainsheet.2020.fall.F383.pdf >.
But it's actually a 1-2-3 snap to remove the file protection:
1* Simply drag the locked pdf file into a Chrome window.
2* Open it using the password.
3* Thru Chrome, print it ("Save as PDF") -- overwriting the locked file or to any filename you prefer.
Voila', the protection is removed.
BeSureToDrinkYourOvaltine