Thanks, Dave. I did eventually figure out how to add another server to 
postgres.app. The whole process was very easy, although rather well-hidden. 
BTW, it was very easy to reconfigure in pgAdmin4 — but maybe add drag-and-drop 
to copy databases between servers? ;)

Jack

> On Mar 4, 2021, at 3:29 PM, Dave Page <dp...@pgadmin.org> wrote:
> 
> EDB installers are designed to support side by side installation of multiple 
> major versions. It works just fine (I’ve been using them like that for years).
> 
> On Thu, 4 Mar 2021 at 23:22, Jack Royal-Gordon <jac...@pobox.com 
> <mailto:jac...@pobox.com>> wrote:
> Thanks, Richard. Honestly, I’d prefer to get it going with the EDB 
> distribution that I already have, but I’m very comfortable with Homebrew so 
> your approach will definitely be my fallback if I can’t do it with EDB.
> 
>> On Mar 4, 2021, at 12:49 PM, Richard Brockie <richard.broc...@gmail.com 
>> <mailto:richard.broc...@gmail.com>> wrote:
>> 
>> Hi Jack,
>> 
>> I was in a similar situation with an old application using pg v9. I 
>> installed different versions of postgres with homebrew on Catalina. I 
>> currently have versions 9, 11 & 12 installed and can have them all running 
>> in parallel listening on different ports. I connect to them all from a 
>> single instance of pgAdmin4 over their respective ports. Testing the 
>> application with the new pg version is also just a port change in the 
>> configuration. It works very well.
>> 
>> Best wishes,
>> R.
>> 
>> 
>> On Thu, Mar 4, 2021 at 11:52 AM Jack Royal-Gordon <jac...@pobox.com 
>> <mailto:jac...@pobox.com>> wrote:
>> I’m using the EDB PG installation on Mac OS 11.1 (Big Sur), which seems to 
>> offer multiple versions. I’m currently running PG10, but I’m looking to 
>> upgrade to PG13 and would like to test with it first. Can I (and if so then 
>> how do i) switch back and forth between PG versions? 
>> 
>> 
>> 
>> -- 
>>     R.
>> 
>> Richard Brockie
>> 
>> Real-time bicycle race management - www.ontheday.net 
>> <http://www.ontheday.net/>
> 
> -- 
> -- 
> Dave Page
> https://pgsnake.blogspot.com <https://pgsnake.blogspot.com/>
> 
> EDB Postgres
> https://www.enterprisedb.com <https://www.enterprisedb.com/>

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