Hmmm… Could be this problem?..
https://forum.arduino.cc/index.php?topic=135195.0
Let’s check! Can you edit line #126 in the platform.txt in the hardware/avr directory where you installed the blinks library?
FROM:
tools.avrdude.upload.pattern="{cmd.path}" "-C{config.path}" -B 4 {upload.verbose} {upload.verify} -p{build.mcu} -cusbtiny "-Uflash:w:{build.path}/{build.project_name}.hex:i" "-Uflash:w:{runtime.platform.path}/cores/blinklib/shared/BlinkBIOS.hex:i" "-Uefuse:w:0xf8:m" -u
TO:
tools.avrdude.upload.pattern="{cmd.path}" "-C{config.path}" -B 4 {upload.verbose} {upload.verify} -p{build.mcu} -cusbtiny -e "-Uflash:w:{build.path}/{build.project_name}.hex:i" "-Uflash:w:{runtime.platform.path}/cores/blinklib/shared/BlinkBIOS.hex:i" "-Uefuse:w:0xf8:m" -u
(there is an extra -e in the middle there)
Then quit out the Arduinio IDE, restart, and try uploading a sketch using the Upload button?
Please report back with what happens!
If it still fails, can you copy/paste the contents of entire bottom build window here?
Thanks!
-josh