First off this, based on what you sent to our support department, this appears to be an INFOR serial number thus you need to contact INFOR about what to install to run their application.
While they generally use standard PxPlus builds they have on occasion used custom builds to address certain issues they were having or to provide special functionality they may have required. INFOR can also advise and supply the WindX which works correctly with their application.
As for software activation, this too needs to be done through INFOR as they have unique activation software that not only activates PxPlus, but also their application which has its own security protection.
With regards to your activation levels, activation keys for newer versions of PxPlus will allow you run older versions of PxPlus. The activation level on the key ONLY establishes the functionality you have been authorized to use. Any PxPlus activation key will allow you to install and run versions of PxPlus up to the level specified in the key, and in addition you can use newer versions of the executable components (Not the library) in order to obtain fixes .
For example a version 10 key will run any version of PxPlus up to and including version 10. It will also allow you to run the version 11 thru 13 executables (EXE/DLL and equivalent on Linux) in order to get access to corrections. If a problem was found in the version 10 executable and was fixed in the version 11 executable, you could install/run the newer executable in order to obtain that fix. This is valid for 3 versions which covers the product support window. Beyond three versions you need to purchase a version upgrade(s) or be on a maintenance program.
Finally, as the serial number you reported on our help desk is from INFOR and you are having trouble, we suggest you contact them for assistance as they can provide the proper versions to install and run along with the proper activation keys.