最新的pgadmin4已经不支持win7系统了。
2016年发布的postgresql9.5.3自带的是pgAdmin3,兼容win7。
https://www.filehorse.com/download-postgresql-32/25830/

PostgreSQL 9.5.3 (32-bit)
May, 12th 2016 - 58.6 MB - Open Source
Operating System
Windows XP / Vista / Windows 7 / Windows 8 / Windows 10
Author
PostgreSQL Global Development Group
Sometimes latest versions of the software can cause issues when
installed on older devices or devices running an older version of the
operating system.
Software makers usually fix these issues but it
can take them some time. What you can do in the meantime is to download
and install an older version of PostgreSQL 9.5.3 (32-bit).
For those interested in downloading the most recent release of PostgreSQL or reading our review, simply click here.
All old versions distributed on our website are completely virus-free and available for download at no cost.
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If you have any questions or ideas that you want to share with us - head over to our Contact page and let us know. We value your feedback!
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