The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/11/pgupgrade.html
Description:
"For Windows users, you must be logged into an administrative account, and
then start a shell as the postgres user and set the proper path:
RUNAS /USER:postgres "CMD.EXE"
SET PATH=%PATH%;C:\Program Files\PostgreSQL\11\bin;
"
Recent versions of PostgreSQL do not run under a Windows user called
"postgres", but under the Network Service. This command therefore fails and
it is not clear how to progress.