There could be a number of contributing factors to why you're experiencing crashes. Assuming that you system doesn't have any issues, I suspect it may be the size of the step files.
Does SolidWorks crash immediately, or at some point after the process has started?
it gets about 80% of the way through opening the files then decides it has had enough.
the one that I seem to be having the most trouble with is 133meg in size.
I wish that I could post the file in question but unfortunately Mercedes and Fiat do not allow this.
I have a mate who is still using 2014 so I might try it on his machine and to see if it is a problem with 2015.
I used to do work with an architectural firm where I'd have to convert their outputted step files to SolidWorks and the same issues as you. Ultimately, I had them break off smaller chunks and then I'd reassemble the building in SolidWorks. Perhaps you can ask the same of Mercedes & Fiat?
Thinking a bit more about it from the other day. Most of the issues I think relate to the initial conversion as it is breaking the part into individual surfaces
If you look at the Rear RH door it has broken all the inner panel into individual surfaces (3659 of them)
If I compare the RH to the Left hand rear door (near identical parts) the file sizes when convert to a .sldprt is 65MB RH, 33LH
The crashing I would think relates not so much to Solidworks but a windows "timeout" issue as it try's to process all of the faces!
For your interest this is the individual part from the disc compared to the complete "part" from the download
Check those crazy surfaces!
Hi Jeff and Micheal thanks fro the replies.
Getting Mercedes an Fiat to beak up their files into smaller chunks unfortunately would be next to impossible.
I spoke to soon Micheal when I said that I had the chassis file sorted. My mate down the the road opened the file in Solidedge and then saved it as an Iges file which we thought would work. I might see if he can save it as a SolidWorks part for me next and see how that goes.
It is frustrating that Solidedge can open the files but Solid works cannot.
Just for giggles I thought I would show how TurboCad opens the same file from the disk.
I'm so glad that I am no longer using TurboCad as our main drawing program anymore.