I have made changes to some of the HTML and need to upgrade from 2.0 to 2.1. Is there a way I can upgrade to 2.1 without losing the edits?
If you made any custom modifications to the uReserve v2.0 script... then, unfortunately, you'll have to re-implement the changes in the newer v2.1 script.
(Most likely any changes that you made were to the "display_week_graphical" subroutine... so hopefully that won't be too difficult to change again.)
And actually, the only change between uReserve 2.0 and uReserve 2.1 was a correction to the number of seconds per year, as described at:
So you may just be able to locate the following line near the top of the script:
$SECONDS_PER_YEAR = 31622400;
And manually change it to:
$SECONDS_PER_YEAR = 31557600;
I think that really was the only correction made there.