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So i have never had any problems importing .blend objects into unity. But I just updated unity and now I get this error “Blender could not convert the .blend to FBX file…” Does anyone have any ideas? I looked through other forms but there was nothing about the new update providing problems with importing.

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This problem happens because Unity keeps its import scripts in a separate location from the 3d applications themselves. What happens when you try to import a .blend file, is unity finds its ‘blender fbx export’ script, and then runs it over your .blend file using your most current version of blender. This is all well and good, as long as both your copy of blender and the import script are the same version. Of course, because Blender typically has a quicker update cycle than Unity, there will often be a mismatch between the two!

To avoid this problem, instead of relying on Unity to convert all of your .blend files to fbx, you should export the files directly from Blender (to ensure that the export script is up to date) and then import the resultant .fbx models into Unity. This also means that you can move your project around safely (if you need to do so for whatever reason) without having to be sure all the computers you are working on have the exact same software on them!

Addendum- the same basic principles should apply for 3d modelling packages other than blender- I use Blender in this case because it is best related to the question (and because it is what I am personally most familiar with).