Can open but not save older sku files in 16

Using Sketch up 16 and uninstalled all older versions. When I open large files created in previous versions, the file opens but cannot be saved. Any help would be appreciated,

Where are you trying to save? What happens when you try to save?


Not even with “Save as …”?

check if you can save with the Windows Wordpad to the path/directory affected.

try if a “File > Save as…” to the Windows desktop works.

Presumably a new installation … ?

Perhaps a permissions issue.
Be certain to “Run as Administrator “ when installing SketchUp and on the first run as well.