ModelMuse Error when importing a MODFLOW 6 model

[Alex Simpson]

Hello everyone! I'm trying to import one of the USGS test files (found here: https://github.com/MODFLOW-ORG/modflow6-largetestmodels/tree/develop/test1201_gwtbuy-elderRa60) into ModelMuse. But, I get this error:
Access violation at address 00000000029AF74D in module 'ModelMuse.exe' (offset 262F74D). Read of address 0000000000000048
C:\WRDAPP\MODFLOW_Models\test1201_gwtbuy-elderRa60\mfsim.nam

Does anyone know what could be causing this? For some context, the model in question is from around 2019 (it was tests of the BUY package). I'm using ModelMuse version 5.4.0.0. Could that be causing the error? I also read that large models can crash ModelMuse, but all of the input files are only 257 KB, is that really the limit?

Any help is appreciated.