Project crashes when I try to open it (crash report attached)

Hello, I have a few saves of a project im working on and one of them (the main most recent one) crashes when I try to open it. Also, when i try and open the project im getting this first person template, rather than any of the saves ive made (it used to open directly into one of the saves). The save that wont open and crashes is the heaviest of all them, but I dont see how it would struggle to suddenly not open, since ive not added anything to it and it had been opening fine before now. The only thing that I did that might have caused this was copy the whole project to a different drive, that is all. The coped file doesnt open the problem save and neither does the orginal - both just crash. Here is a crash files if anyone is able to make sense of what is happening.
https://drive.google.com/drive/folders/1cVTexYSZqOilCm7bZcYaBXa6EIj2gdOX?usp=sharing

any help would be appreciated

UE4.26.2

If you have recently reinstalled 4.26 make sure you have installed to engine all plugins you have install like MarketPlace/Substance, CC3 Unreal Link for the shader types

Files on Z:/Current_Lun7 4.26 seem to be corrupt

I does attempt to auto launch the save but errors out

Thank you.
Do you have any idea what might have caused the error on those files, or how to correct them?
Like, can i roll back to aqn earlier version or something? (ive never had anything like this happen before)

Not easy to say what happened LogFileManager the only one complaining, What version was the saves last opened in/ created?

Last saves were in 4.26.2. Even if I roll back a month it’s ok, but im not sure how to do that…is it possible?


Do i open UMAP files? - if so, how do i do that?