move project error

hi all
i have an big project with 55 GB Files.
like this is place of project.
1- E:\Backup\MyGame\ this is my project.
2- E:\MyGame\ i copy project to this.
my first engine is 3.4.2 and i want to use 3.5.1 for second project. when it starting then it start asset importing but in the end of it then get an error. how can i do this?
what is my problem?
any one can help?
thankful.

If it’s a fatal error you are getting, then Unity is running out of memory while importing your assets. Please upload your project on a ftp server and submit a bug report to Unity about this including the connection details to the server. Your project is treated as extremely sensitive data at Unity and is only used for internal testing and bug fixing. Unity is in great need of really big projects now (over 20 GB in size), so sending yours to them will really, really help avoid these kind of issues in future Unity versions.