To install the helper, you need to uncompress it at first. After uncompressing it, you will see the following files in the target folder.
Then, you need to create a new folder named bypasscaptcha under your JDownloader folder. Normally it is at C:\Program Files\JDownloader\jd\captcha\methods\, but it may be different if you did not install your JDownloader at the default folder.
Then copy all the files into the new bypasscaptcha folder.
Check the new folder bypasscaptcha, there should be a file named key.txt . Open it and erase all old text, fill your bypasscaptcha key there. Do not have one? Order it now.
Click file ShowBalance.bat and see if you have configured it correctly. Also click file Test.bat to submit the sample captcha for testing.