You can increase the VM arguments, on %PUBLISHER_INSTALL_DIR%\publisher.ini, like:
-startup
plugins/org.eclipse.equinox.launcher_1.5.700.v20200207-2156.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.1200.v20200508-1552
-clean
-vmargs
-Dosgi.requiredJavaVersion=11
-Dosgi.instance.area.default=@user.home/ea2md-workspace
-Xms256m
-Xmx10g
Note 1: The values to set depend on the specifications of the system you are working on. If this is not enough, you could try to increase again the Xmx value.
If during your work the out of memory error dialog box appears, change the Java Heap size and the MaxPermSize directly in this dialog box.
In the Xmx field change the number of heap size to bigger heap size in megabytes. In the XX:MaxPermSize field you can increase the MaxPermSize.
You can also change the java heap size or MaxPermSize in the magicdraw.properties file.
To obtain the license information needed, run FlexNet LMTools GUI.
Select System Settings tabulation, then Save HOSTID info to a File by clicking the corresponding button.
Provide the generated file to the support team.