[Android Apps and Games] nioBee:
Here the log I get using either the BAT file or the PowerShell File:

Please connect your Android device with USB Debugging enabled:

* daemon not running. starting it now on port 5037 *
* daemon started successfully *

WhatsApp 2.19.34 installed

Found legacy WhatsApp 2.11.431 in local folder

Backing up WhatsApp 2.19.34
2475 KB/s (25385434 bytes in 10.014s)
Backup complete

Removing WhatsApp 2.19.34 skipping data
Success
Removal complete

Installing legacy WhatsApp 2.11.431
2983 KB/s (18329558 bytes in 5.999s)
Failure [INSTALL_FAILED_VERSION_DOWNGRADE]
Install complete

Now unlock your device and confirm the backup operation.

Please enter your backup password (leave blank for none) and press Enter:

Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
Caused by: java.lang.RuntimeException: java.lang.IllegalArgumentException: Don't know how to process version 5
at org.nick.abe.AndroidBackup.extractAsTar(AndroidBackup.java:420)
at org.nick.abe.Main.main(Main.java:128)
... 5 more
Caused by: java.lang.IllegalArgumentException: Don't know how to process version 5
at org.nick.abe.AndroidBackup.extractAsTar(AndroidBackup.java:282)
... 6 more
bin\tar.exe: Cannot open tmp\whatsapp.tar: No such file or directory
bin\tar.exe: Error is not recoverable: exiting now
bin\tar.exe: Cannot open tmp\whatsapp.tar: No such file or directory
bin\tar.exe: Error is not recoverable: exiting now
bin\tar.exe: Cannot open tmp\whatsapp.tar: No such file or directory
bin\tar.exe: Error is not recoverable: exiting now
bin\tar.exe: Cannot open tmp\whatsapp.tar: No such file or directory
bin\tar.exe: Error is not recoverable: exiting now
bin\tar.exe: Cannot open tmp\whatsapp.tar: No such file or directory
bin\tar.exe: Error is not recoverable: exiting now

Cleaning up temporary files ...

File eliminato - C:\WhatsApp-Key-DB-Extractor-master\tmp\whatsapp.ab
File eliminato - C:\WhatsApp-Key-DB-Extractor-master\tmp\waplen.txt
File eliminato - C:\WhatsApp-Key-DB-Extractor-master\tmp\sdpath.txt
File eliminato - C:\WhatsApp-Key-DB-Extractor-master\tmp\wapath.txt
File eliminato - C:\WhatsApp-Key-DB-Extractor-master\tmp\wapver.txt
File eliminato - C:\WhatsApp-Key-DB-Extractor-master\tmp\sdkver.txt

Done

Restoring WhatsApp 2.19.34
4926 KB/s (25385434 bytes in 5.031s)
Success

Restore complete

Removing WhatsApp 2.19.34 temporary apk
File eliminato - C:\WhatsApp-Key-DB-Extractor-master\tmp\base.apk

Operation complete

I don't understand If I get the error because the legacy version cannot be installed or by some Java problem... :confused:

UPDATE: I think I found the problem... on android 7 you cannot install the legacy version of whatsapp, the system won't allow you to do so... I tried also with other softwares but every time the app doesn't install.. I have an older phone with android 4.4.2 and the extractor worked like a charm.. so I really think it isn't compatible with android 7 or later versions.. :crying: