UG Migrate D6/D7 - For filenames with spaces, when replacing absolute urls with relative urls, Update Migration classes uses a space instead of %20 in the link URL #571
Workaround: Enable Pathologic. Configuration is recommended, however, even without configuration, the module will fix up URLs so spaces are replaced by %20 in links.
This relates to the Update Migration class which replaces absolute URLs with relative URLs.
When filenames have spaces in them, the Update Migration classes is inserting a space instead of %20.
This results in the following:
Instead of: