The link here works fine and takes you to the right place. The download link, however, does not include the library.properties file, so you can't upload it to the ArduinoIDE.
2021-07-11Mark Hoffman
How do I download the FreqCounter library?
2015-11-19codebender
This library and its examples were tested on 2016-06-11 with common Arduino boards. For more detailed information about the test results, please look at each example's comments.
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