Converting v2023.5 file crashes out of MYOB Account Right

I have tried on several computers to upgrade a file that is v2023.5 and each time it says that it has been updated successfully but then it doesn't actually open up and I am crashed out of MYOB.  I have just tried to attach the .myox file that says it is 8.6 MB but it failed to upload.  How can I regain access to this file that is only used less than half a dozen times a year but it's needed for 30 June reporting?