I downloaded and ran "setup.exe" from https://symfony.com/download. Installation seemed to run well.
Calling
symfony --version
results in
Symfony Installer version 1.5.11
There might be installed an old Symfony version on the system - however I cant find any hint on where it actualy runs the old exectuable from (nothing obvious in System Path). Also - shouldn't this installer just update the symfony version running?
If I download the current symfony exectuable "symfony_windows_amd64.exe" from the same page as stated at the top and run
[pathToExecutable]/symfony_windows_amd64.exe -V
it states
Symfony CLI version v4.12.0 (Tue Jan 7 16:14:26 CET 2020)
which I expect to happen when just running "symfony".