When I try to start the software installation module in Yast2, I get the
following error message:

Internal error. Please report a bug report with logs.
Run save_y2logs to get complete logs.
Details: Failed to load Module 'Packages' due to: Failed to load Module
'AddOnProduct' due to: Failed to load Module 'ProductLicense' due to: cannot
load such file -- y2packager/product
Caller:  /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in
`require'

I have run save_y2logs; please let me know if you need the resulting file.