[GNC] balance of interests between users and developers

[flywire]

> If the new version could be installed alongside the current version and
data files kept separate

It's not necessarily new version and current version. Two versions, same
computer -
https://lists.gnucash.org/pipermail/gnucash-user/2023-March/105955.html

In Windows, use GnuCash installed on system for testing and the desired
GnuCashPortable version for the real books.