@echo off

SET JAVA_JRE_PATH="C:\Program Files (x86)\Java\jre1.8.0_201\bin\javaw.exe"
SET JAVA_APP_PATH="T:\RxTxInstaller.jar"

net session >nul 2>&1

if %errorLevel% == 0 (
    %JAVA_JRE_PATH% -jar %JAVA_APP_PATH%
) else (
    powershell -Command "Start-Process '%~f0' -Verb RunAs"
)