Joomla 6 Compatibility Issue: Class "JComponentHelper" not found

Hi everyone,

I have a website running Joomla 5.4.8 + YTP 5 + JDownloads 4.1.

I wanted to upgrade to Joomla 6, but in order to do so I need to disable the Backward Compatibility plugin. However, when I disable it, I get the following error:

     Class "JComponentHelper" not found 

Call Stack
#     Function     Location
1     ()     JROOT/plugins/system/jp_ce_jdownloads_list/jp_ce_jdownloads_list.php:34
2     plgSystemJp_ce_jdownloads_list->onAfterInitialise()     JROOT/libraries/src/Plugin/CMSPlugin.php:320