No map on the Frontend

Hi, I really love the tool zhosmmap and I use it on my website about our travels, see  www.marionandalfred.de/ . Now I am in the migration process to Joomla 4 (version 4.3.3) and my website does not display the maps. In the life version I use the package version 6.6.01 of Zh OpenStreetMap, see also for instance  www.marionandalfred.de/index.php?option=...kerlink=0&Itemid=489 . With all later versions I tried, including 7.22.6.14 (for Joomla 3) and 11.23.7.14 (for Joomla 4) I have no may on the frontend. For my development system I use xampp, with php 8.2.4 and also php 7.4.11.
I guess the problem is the following line var icoIcon4Size='C:\xampp8\htdocs\marionandalfred4/components/com_zhosmmap/assets/icons/' in index.php; because the backslash stops Java execution. How can I change this line for example like previous previous line var icoUtils='https://localhost/marionandalfred4/components/com_zhosmmap/assets/utils/';? I attached a screenshoot from debugging this issue, please see blue line on the right and red line on the right bottom.
In the version 6.6.01 of Zh OpenStreetMap the variable icoIcon4Size doesn't exist - this might be an explanation why this version works.
Thanks a lot - Alfred