win 6.1.4 won't overwrite output files

     ##################### end of pdftex log file #####################
     C:\Program Files (x86)\Therion\therion.exe: error -- filesystem error: cannot copy: File exists [C:\Users...\AppData\Local\Temp\th10908\data.pdf] [cave_name.pdf]
     writing xtherion file ... done

I hit this with every survey. Reverting to 6.1.3 works fine

Raised as case https://github.com/therion/therion/issues/480

I looked at the commits since 6.1.3 and it's way beyond me.  Thanks for making Therion such a good project!

Henry