NullpointerException trying to download firmware

[inoop]

Trying to flash tgy_reverse, I get the following:

Download finished: /home/niels/Downloads/esc/tmp/tgy-2015-04-19.zip
path to zipFile: /home/niels/Downloads/esc/tmp/tgy-2015-04-19.zip
file to extract: tgy_reverse.hex
Feb 28, 2019 8:49:41 AM de.lazyzero.kkMulticopterFlashTool.KKMulticopterFlashTool err
WARNING: The downloaded zip file containing the choosen hex was damaged, try again. If that doesn't work restart the application.
Feb 28, 2019 8:49:41 AM de.lazyzero.kkMulticopterFlashTool.KKMulticopterFlashTool err
WARNING: If the problem still occures, write a bug report.
java.lang.NullPointerException
at java.base/java.io.File.(File.java:276)
at de.lazyzero.kkMulticopterFlashTool.utils.Zip.unzipFile(Zip.java:102)
at de.lazyzero.kkMulticopterFlashTool.utils.Firmware.getFile(Firmware.java:180)
at de.lazyzero.kkMulticopterFlashTool.KKMulticopterFlashTool$2.run(KKMulticopterFlashTool.java:436)
Feb 28, 2019 8:49:41 AM de.lazyzero.kkMulticopterFlashTool.KKMulticopterFlashTool err
WARNING: Error during writing flash.
Feb 28, 2019 8:49:41 AM de.lazyzero.kkMulticopterFlashTool.KKMulticopterFlashTool$2 run
WARNING: error.writeflash