If you are running X-Plane as administrator, chances are you should run OAV ACARS as administrator too in order for it to connect to the simulator.
OAV ACARS installation folder is located at C:\Users\username\AppData\Local\Apps\2.0. There you will find 2 more subfolders with a strange name and inside a folder with the name oava..tion...Enter that one and mark oavacars.exe to run as administrator.
XPlane altitude always 0:
If ACARS is not reading correctly the altitude of the aircraft and is always displaying 0 as a value, open XPUIPCOffsets.cfg with a text editor (e.g. Notepad++) and add the following to the end of the file
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Dataref PosElevation sim/flightmodel/position/elevation float
Offset 0x34B0 FLOAT64 3 rw $PosElevation
Dataref TotalFlightTimeSec sim/time/total_flight_time_sec float
Offset 0x04A8 FLOAT64 3 rw $TotalFlightTimeSec
XPUIPC ip address error:
Regarding the IP address error, open XPUIPC.ini, change the Server Address to your computer's IP address and it will go away:
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Server Address = xxx.xxx.xxx.xxx
As always, if you are still having issues, just report it in this forum.