Low on Memory?! Cant save!

I have this same issue.  I am running Storyline 3 on VMWare and all my projects are run locally.  I have no other programs open in Windows when this is happening. I'm in the middle of working on a project, and I get 2 separate error messages:
"The project file could not be saved. Can not access a closed Stream."
and
"Close non-essential applications and save your project file."

This is a large project, around 678 MB. 
I am unable to save my work at the point these error messages pop-up. This has happened to me several times already and keeps becoming more and more frequent. I deleted the temp files in the %temp% folder and even increased the memory in my VMware. However this only works for about 5 minutes. I have to keep deleting the temp folder every 5 minutes. I already contacted technical support, but the solution they gave me was NOT a solution. They want me to copy all my slides into a new instance, however when the error message shows up, it says I don't even have enough memory to create a new instance. It freezes and then I have to force quit and I lose my saved data; having to start over again. I am running a 64 bit version of VMware. Why hasn't Storyline been upgraded to 64 bit by now? My company has spent a lot of money on this program, and it's gotten to the point where it is becoming unusable. I can't find a solution and I am on a strict deadline. Please help!