"Fusion 360 is unable to open ...."

[KlausKa]

I created a new design with Fusion 360 (free) on a macbook pro M1, save it and close Fusion on the mac, but cannot open it afterwards on Windows 10 anaymore. Message as shown in title.

Diagnostic log attached. - Thanks for your help in advance.

[bentwookie · Accepted solution]

Are both your Mac and Windows installs running the same version of Fusion? 

I'm not great at reading these logs, but I do see this:

20220927T205431 E .16632 Forward compatibility is not supported:2.0.14113 - The file you are trying to open was last saved in a newer version of the software. It cannot be opened!

That would jive with one of your machines being on 2.0.14113 and the other being on something like 

2.0.14337. 

Twice in two weeks I've found that my Mac has updated and my Windows machine has not. It's lead me to situations like you're seeing where it won't open files. 

[KlausKa · Accepted solution]

Hi bentwookie, thanks for the swift response. Your advice made me checking
the versions again. Actually I installed the latest version about 4 weeks
ago. However, now I found out that the installation of the new version on
Windows 10 left 2 Fusion 360 versions on the system. Since my old version
was fixed on the Windows task bar, I unintentionally open the old Fusion 360
version always.

The problem is solved when I open the latest Fusion 360 version.

Thank you.

[krr120]

This has happened to me as well in the same scenario on several designs.  I rely on Fusion to update it self and it seems to do so on both Mac and Windows OS but they are at different versions.  Is there a way to force an update from within the application?

[bentwookie]

When I'm very paranoid about the right version coming down, I'll uninstall, download the installer from Autodesk and then reinstall. 

The simpler way that probably works just as well is to hold down control-shift on Windows or Command-Shift on MacOS while launching Fusion. This will bring up the Service Utility and from there you can Repair Fusion. That will clear some caches and reinstall. I'm 99% sure it would install a newer version over an older one, but I've not seen that spelled out in a KB article.