The readme is here...

http://poser.smithmicro.com/update_files/Poser10SR3.1Readme.rtf

 

I'd reinstall Poser and the update.  What I do for PP2014 is to enter my serial number into the Download Manager and it will redownload all of the files, with the update (ver. 10.0.3.26510) incorporated. Make sure your Download Manager settings are set to keep a version or two's installation files.

After it downloads, install, and since you are having problems, tell the installer to backup existing preference files, and to install the content in the directory where you previously installed it.  Once it's running, you can find tghe backed up preference foles somewhere in uour user folder in the hidden folser AppDataRoaming somewhere, and replacing the corresponding files in AppDataRoamingPoser10; you certainly will want to replace LibraryPrefs.xml if you have external runtimes....

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