Windows install page: what to know before you start (from dev c59774b8252d)

Administrator rights for the prerequisites, none for the build and
everyday use; an hour or two for a first install, TeX Live alone twenty
to thirty minutes.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

README.md

@@ -53,7 +53,7 @@ are regenerated on each release — patches cannot be merged directly.
 Report problems (or send patches) to the author; accepted changes are
 applied to the development tree and appear in a following snapshot.
 
-This snapshot was assembled from development commit `9d6f66456a3d`.
+This snapshot was assembled from development commit `c59774b8252d`.
 
 ## License
 

doc/install/windows_source_install.md

@@ -21,6 +21,13 @@ container images run on Windows through Docker Desktop, which that page
 also describes. This page is the native route: Windows programs, no
 Linux layer.
 
+**Before you start.** The prerequisites install for all users of the
+machine, so the account you use must be an administrator, which on a
+personal machine it normally is; the build and everyday use need no
+special rights. Allow an hour or two the first time: the downloads are
+about a gigabyte in all, TeX Live alone takes twenty to thirty minutes,
+and the build a few minutes. Nothing here needs to be done twice.
+
 
 ## Prerequisites