problem with downgrading version java on soapui5.7 to java 1.8

I want downgrading version java on soapui5.7 to java  1.8 but i have this error  AppData\Local\SmartBear\SoapUI-5.7.2\bin>soapui.bat
java version "1.8.0_202"
Java(TM) SE Runtime Environment (build 1.8.0_202-b08)
Java HotSpot(TM) 64-Bit Server VM (build 25.202-b08, mixed mode)
The filename, directory name, or volume label syntax is incorrect.
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/eviware/soapui/tools/JfxrtLocator has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0