I think the planes for the Standard version of MSFS 2024 were unencrypted back in December: Request for the Unencryption and Full Downloadability of Default Aircraft in MSFS 2024 - #346 by pupper252773
It’s the Deluxe and Premium Deluxe versions that are still encrypted. However, the Twin Otter is a Standard version plane, so it should have been unencrypted back in December.
And there are already some liveries for the Asobo Twin Otter at flightsim.to. Unfortuantely, nobody has made a Trans Maldivian livery for the float version of the Asobo Twin Otter yet at flightsim.to.