install failure, 5.6

[fotobear]

I am a long-time user, and am trying to update to 5.6 on my Yosemite Mac.

I get a series of errors during the install process, starting with:
https://www.dropbox.com/s/x3n6qih1fmsyst...6.png?dl=0

and ending with:
https://www.dropbox.com/s/a107f3w1v20b59...3.png?dl=0

This is the log file:
Exception:

java.io.FileNotFoundException: /Applications/Vuze.app/Contents/Resources/app/.install4j/response.varfile (Permission denied)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:194)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:145)
    at com.install4j.runtime.beans.actions.InstallFilesAction.writeResponseFile(Unknown Source)
    at com.install4j.runtime.beans.actions.InstallFilesAction.install(Unknown Source)
    at com.install4j.runtime.installer.InstallerContextImpl$2.fetchValue(Unknown Source)
    at com.install4j.runtime.installer.helper.comm.actions.FetchObjectAction.execute(Unknown Source)
    at com.install4j.runtime.installer.helper.comm.HelperCommunication.executeActionDirect(Unknown Source)
    at com.install4j.runtime.installer.helper.comm.HelperCommunication.executeActionInt(Unknown Source)
    at com.install4j.runtime.installer.helper.comm.HelperCommunication.executeActionChecked(Unknown Source)
    at com.install4j.runtime.installer.helper.comm.HelperCommunication.fetchObjectChecked(Unknown Source)
    at com.install4j.runtime.installer.InstallerContextImpl.performActionIntStatic(Unknown Source)
    at com.install4j.runtime.installer.InstallerContextImpl.performActionInt(Unknown Source)
    at com.install4j.runtime.installer.ContextImpl.performAction(Unknown Source)
    at com.install4j.runtime.installer.controller.Controller.executeActions(Unknown Source)
    at com.install4j.runtime.installer.controller.Controller.handleCommand(Unknown Source)
    at com.install4j.runtime.installer.controller.Controller.start(Unknown Source)
    at com.install4j.runtime.installer.Installer.runInProcess(Unknown Source)
    at com.install4j.runtime.installer.Installer.main(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)
    at com.install4j.runtime.launcher.MacLauncher.main(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at apple.launcher.LaunchRunner.run(LaunchRunner.java:116)
    at apple.launcher.LaunchRunner.callMain(LaunchRunner.java:51)
    at apple.launcher.JavaApplicationLauncher.launch(JavaApplicationLauncher.java:52)

System properties:

java.runtime.name=Java™ SE Runtime Environment
exe4j.moduleName=/Users/brianwatson/Library/Application Support/Vuze/tmp/AZU2560129124294348343.tmp/Vuze Installer.app
sun.boot.library.path=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Libraries
java.vm.version=20.65-b04-466.1
awt.nativeDoubleBuffering=true
gopherProxySet=false
mrj.build=11M4716
java.vm.vendor=Apple Inc.
java.vendor.url=http://www.apple.com/
path.separator=:
java.vm.name=Java HotSpot™ 64-Bit Server VM
file.encoding.pkg=sun.io
user.country=US
sun.os.patch.level=unknown
install4j.exeDir=/Users/brianwatson/Library/Application Support/Vuze/tmp/AZU2560129124294348343.tmp/
java.vm.specification.name=Java Virtual Machine Specification
user.dir=/Users/brianwatson/Library/Application Support/Vuze/tmp/AZU2560129124294348343.tmp/Vuze Installer.app/Contents/Resources/app
java.runtime.version=1.6.0_65-b14-466.1-11M4716
jdk.lang.Process.launchMechanism=POSIX_SPAWN
java.awt.graphicsenv=apple.awt.CGraphicsEnvironment
java.endorsed.dirs=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/endorsed
os.arch=x86_64
apple.awt.graphics.UseOpenGL=false
java.io.tmpdir=/var/folders/55/ktx3jq9x7h3bs5lgydn3sf900000gn/T/
line.separator=

java.vm.specification.vendor=Sun Microsystems Inc.
os.name=Mac OS X
proxySet=false
sun.java2d.noddraw=true
sun.jnu.encoding=MacRoman
java.library.path=/Users/brianwatson/Library/Application Support/Vuze/tmp/AZU2560129124294348343.tmp/Vuze Installer.app/Contents/Resources/Java:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources:.:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
java.specification.name=Java Platform API Specification
java.class.version=50.0
sun.management.compiler=HotSpot 64-Bit Tiered Compilers
os.version=10.10.1
http.nonProxyHosts=local|*.local|169.254/16|*.169.254/16
user.home=/Users/brianwatson
user.timezone=America/Los_Angeles
java.awt.printerjob=apple.awt.CPrinterJob
file.encoding=MacRoman
java.specification.version=1.6
java.class.path=/Users/brianwatson/Library/Application Support/Vuze/tmp/AZU2560129124294348343.tmp/Vuze Installer.app/Contents/Resources/app/.install4j/i4jruntime.jar:/Users/brianwatson/Library/Application Support/Vuze/tmp/AZU2560129124294348343.tmp/Vuze Installer.app/Contents/Resources/app/user.jar
user.name=brianwatson
apple.awt.graphics.UseQuartz=true
java.vm.specification.version=1.0
java.home=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
sun.arch.data.model=64
user.language=en
java.specification.vendor=Sun Microsystems Inc.
awt.toolkit=apple.awt.CToolkit
java.vm.info=mixed mode
java.version=1.6.0_65
java.ext.dirs=/Library/Java/Extensions:/System/Library/Java/Extensions:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext
sun.boot.class.path=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jsfd.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar:/System/Library/Frameworks/JavaVM.framework/Frameworks/JavaRuntimeSupport.framework/Resources/Java/JavaRuntimeSupport.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/ui.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/laf.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/sunrsasign.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jsse.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jce.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/charsets.jar:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar
install4j.appDir=/Users/brianwatson/Library/Application Support/Vuze/tmp/AZU2560129124294348343.tmp/Vuze Installer.app/Contents/Resources/app/
java.vendor=Apple Inc.
file.separator=/
java.vendor.url.bug=http://bugreport.apple.com/
sun.io.unicode.encoding=UnicodeLittle
sun.cpu.endian=little
install4j.systemLanguage=en
mrj.version=1070.1.6.0_65-466.1
socksNonProxyHosts=local|*.local|169.254/16|*.169.254/16
http://ftp.nonProxyHosts=local|*.local|1...169.254/16
sun.awt.exception.handler=apple.awt.CToolkit$EventQueueExceptionHandler
sun.cpu.isalist=
 

What's going on? As a matter of course, I am custom installing just the app.