Details of KNX versions and compatibility which is good to keep a note of!
ETS Project version support
ETS Version First supported KNX Driver version Since
(XML Version)
ETS 5.6 (XML v14) 4.3.x1..5 March 2018
ETS 5.7 (XML v20) 3.8.7 / 4.4.7 / 4.7.7 / 4.8.7 May 2019
ETS 6 (XML v21) 4.10.9.4 / 4.11.9.4 / 4.12.9.x May 2022
ETS 6.1 (XML v22) 4.10.9.8 / 4.12.9.6 / 4.13.9.x July 2023
ETS 6.2 (XML v23) 4.10.9.16 / 4.13.9.14 / 4.14.x March 2024
ETS 6.2.1 (XML v23) 4.10.9.18 / 4.13.9.16 / 4.14.2 June 2024
The newer ets versions 6.3+ didn't make any changes to the ProjectFile schema so also work with the latest drivers.
Niagara 4.12 is no-longer supported so the latest drivers from the Software portal ought to get you to ets 6.1, but upgrade to latest versions for continued support (Currently 4.14u2, 4.15u1).
Other problems that stop the project importing:
-Ets password protected projects can't be imported, solution is to save the project without a password.
-Ets projects containing non-utf8 characters can't be imported unless you select non-default codepage as follows (in 4.13u3):
A new import option is now available to allow the user to specify a custom character set, for all people who have reported this issue so far, the default of CP437 should work: