The following bug has been logged on the website:
Bug reference: 16509
Logged by: Pierre Mantha
Email address: thecobv@gmail.com
PostgreSQL version: 10.9
Operating system: Windows 10 Pro
Description:
Hi
Noticed that we were running a 32 bit version.
Attempted to install 64 bit version.
Deleted all directories, all entries from registry - expect some temp that
would not allow deletion.
Rebooted
attempted to run installer for 64 bit version and keep getting this
message:
" You already have a 32 bit installation of pgAdmin4, Please uninstall this
before installing the
64 bit version".
So basically your uninstall process does not clear ALL values as this is
litterally impossible to do.