Use pg_restore with this option (since the owner information makes no sense in another environment):
-x, --no-privileges, --no-acl Prevent restoration of access privileges (grant/revoke commands).
Also had the same issue. Used Hans feedback and managed to get Postgres working;
Open command line window.
Go to Postgres bin folder. For example:
cd "C:\Program Files\PostgreSQL\9.6\bin"
Enter the command to restore your database. For example:
pg_restore --no-owner --no-privileges --no-acl -U <Username> -d <DBName> -1 "C:\...\db.backup"
Where <Username>, <DBName> and filepath are replaced to match your setup.
Type password for your postgres user.