I’ve finished posting the stackbuilder installers for PostgreSQL 64-bit (12,11,10) for PostGIS 3.0 bundle to stackbuilder and OSGeo downloads.
As detailed on the windows page:
https://postgis.net/windows_downloads/
These installers include the following extensions
PostGIS 3.0.0 (postgis, postgis_raster, postgis_topology, postgis_sfcgal, address_standardizer, postgis_tiger_geocoder)
pgrouting 3.0.0-beta
ogrfdw 1.0.8
pgpointcloud 1.2.0
if you run into issues you can report on the mailing lists.
Thanks,
Regina
PostGIS Bunlde for Windows Stackbuilder Maintainer