positive test report
xampp-windows-x64-8.0.25-0-VS16-installer
installed on laptop
joomla 4.2.6 installed
com_jdownloads_pre_beta_4_0_10 installed with no error messages
adjusted settings
3 directories created
Files copied into three directories
com_jdownloads_pre_beta_4_0_11 installed with no error messages
Adjusted layout
3 menu items created and successfully tested
for me it is clear: 4_0_11 is oK
Many thanks to everyone who has helped so far.
jD_tester