Windows $civicrm_paths['civicrm.root']['url'] incorrect
On a functioning windows install of D7/CiviCRM 5.19, an upgrade to 5.24 and 5.25 resulted in a very broken install and inability to run the upgrade url.
Fixed by setting $civicrm_paths['civicrm.root']['url'] in my civicrm.settings.php file.
Setting $civicrm_setting['URL Preferences']['userFrameworkResourceURL'] did not work.
All css/js urls appeared to have been generated by using CIVICRM_UF_BASEURL.$civicrm_root (i.e. the path was prefixed by C:/).