Error uploading to ATTiny85

I've just done a fresh install of 1.8.13 and then added to the boards manager.

When I try to compile and upload a simple test example I get the error:

An error occurred while uploading the sketch
avrdude: can't open config file "C:\Users\robert\AppData\Local\Arduino15\packages\attiny\hardware\avr\1.0.2/avrdude.conf": No such file or directory
avrdude: error reading system wide configuration file "C:\Users\robert\AppData\Local\Arduino15\packages\attiny\hardware\avr\1.0.2/avrdude.conf"

I notice there's no avrdude.conf in the github repo. Should there be? There's a conf file in the MightyCore/hardware/avr/2.1.3 directory and there's actually an entry for ATtiny85 in "C:\Users\xxx\AppData\Local\Arduino15\packages\attiny\hardware\avr\1.0.2/avrdude.conf" for the nightly build.

What do I need to do to use the ATtiny with the IDE?

The best core that I found for tiny85 is Spence Konde's ATTinyCore core.

Installation instructions are on the linked page.

That core has many advantages over other cores and is actively maintained.

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