[2.0.4] Windows 10: Java 15: SikuliX IDE hangs on startup ---- use Java 11

Hi,
I'ma great fun of Sikuli!
Got recently some troubles after moving to Win 10. Aparently, application does not want to start, it seems to be hanging on Jyton task. Please refer to below debug log:

PS C:\sikuliX> java -jar .\sikulixide-2.0.4.jar -c -v
[DEBUG]startUp: IDE: Running: C:\sikuliX\sikulixide-2.0.4.jar
[DEBUG]startUp: IDE: AppData: C:\Users\micha\AppData\Roaming\Sikulix
[DEBUG]startUp: IDE: starting with classpath: .\sikulixide-2.0.4.jar ...
[DEBUG]startUp: IDE: no extensions.txt nor valid content
[DEBUG]startUp: IDE: adding extension file: C:\Users\micha\AppData\Roaming\Sikulix\Extensions\jython-standalone-2.7.1.jar
[153 debug] RunTime:temp folder ok: C:\Users\micha\AppData\Local\Temp\Sikulix_1950272480
Options: *** options dump
Options: testing =
Options: OptionsFile = C:\Users\micha\AppData\Roaming\Sikulix\SikulixStore\SikulixOptions.txt
Options: *** options dump end
***** show environment for 2.0.4-2020-03-14_08:01 API
user.home: C:\Users\micha
user.dir (work dir): C:\sikuliX
user.name: micha
java.io.tmpdir: C:\Users\micha\AppData\Local\Temp
running 64Bit(amd64) on w (10.0) from a jar
java 15 version 15 vm 15.0.1+9-18 class 59.0 arch 64
app data folder: C:\Users\micha\AppData\Roaming\Sikulix
executing jar: C:\sikuliX\sikulixide-2.0.4.jar
*** classpath dump sikulix
  0: .\sikulixide-2.0.4.jar
*** classpath dump end
***** show environment end
[DEBUG]startUp: IDE: *********************** leaving start
[34 debug] Sikulix: starting IDE
[55 debug] RunTime:temp folder ok: C:\Users\micha\AppData\Local\Temp\Sikulix_597496821
Options: *** options dump
Options: testing =
Options: OptionsFile = C:\Users\micha\AppData\Roaming\Sikulix\SikulixStore\SikulixOptions.txt
Options: *** options dump end
***** show environment for 2.0.4-2020-03-14_08:01 IDE
user.home: C:\Users\micha
user.dir (work dir): C:\sikuliX
user.name: micha
java.io.tmpdir: C:\Users\micha\AppData\Local\Temp
running 64Bit(amd64) on w (10.0) from a jar
java 15 version 15 vm 15.0.1+9-18 class 59.0 arch 64
app data folder: C:\Users\micha\AppData\Roaming\Sikulix
executing jar: C:\sikuliX\sikulixide-2.0.4.jar
*** classpath dump sikulix
  0: C:\sikuliX\sikulixide-2.0.4.jar
  1: C:\Users\micha\AppData\Roaming\Sikulix\Extensions\jython-standalone-2.7.1.jar
  2: .\sikulixide-2.0.4.jar
*** classpath dump end
***** show environment end
[312 debug] IDE: running with Locale: pl_PL
[DEBUG]startUp: IDE: --- Sikuli parameters ---
[DEBUG]startUp: IDE: 1: -c
[DEBUG]startUp: IDE: 2: -v
[325 debug] HotkeyManager: add Capture Hotkey: CTRL+SHIFT 2 (50, 3)
[472 debug] HotkeyManager: add Abort Hotkey: ALT+SHIFT C (67, 9)
[473 debug] IDE: Init ScriptingSupport
[476 debug] IDESupport: enter
[1200 debug] Runner: added: NetworkRunner [] NET
[1201 debug] Runner: added: PackedSikulix [skl] text/skl
[1201 debug] Runner: added: PowerShell [ps1] text/powershell
[1202 debug] Runner: added: Text [txt] text/text
[1202 debug] Runner: added: SikulixJar [jar] text/jar
[1203 debug] Runner: init: class org.sikuli.script.runners.AbstractLocalFileScriptRunner: warning: not possible
[1203 debug] Runner: added: Sikulix [] directory/sikulix
[1210 debug] Runner: added: Jython [py] text/jython

... and nothing happens

please help:-)