Thanks Fredo.
I applied Tig's solution and so far with SU open since last night working on and off and checking there have been no errors.
I'm wondering if using SU 2017 changes files in LIBFREDO6_DATA_Dir that make it incompatible with SU 2021. I'd test it but I'm hoping it's fixed now. Found some files from 2018 in the LIBFREDO6_DATA_Dir before I deleted the contents.
I hope I don't go back now to find myself back at square one with this.
@fredo6 said:
There seems to be problems when writing to files. It might be that the installation of Sketchup does not allow to access file in write or copy.
Maybe this is also related to Windows 7.
So I would suggest you do what TIG suggested, that is, Install with Run as administrator.
Fredo