Unable to load resource sshvnc-edmz.jar after java update to 1.8.0_341 with TPAM 2.5.923.0184

I've used TPAM before from this machine successfully, but not for some time.  I updated java this morning - maybe that's pure coincidence, but its the most recent major change I can think of - and now TPAM doesn't work. 

I get the "Unable to launch the application" error, with the exception:

com.sun.deploy.net.FailedDownloadException: Unable to load resource: xxxx.xxxx.xxxx/.../sshvnc-edmz.jar
at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
at com.sun.deploy.net.DownloadEngine.downloadResource(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

(The URL replaced by xxxx.xxxx.xxxx is correct.)

TPAM version: 2.5.923.0184

Java version:

java version "1.8.0_341"
Java(TM) SE Runtime Environment (build 1.8.0_341-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.341-b10, mixed mode)

Any suggestions as to what to try?