The new version of Joomla is much stricter with language constants, and Helix ultimate both the plugin and the templates have the translation for COM_FINDER_ADVANCED_TIPS in several lines when it should be only in one line so to solve it do the following:
1. open /language/en-GB/en-GB.tpl_ut_binv.ini (if you use another template the file must be en-GB.tpl_ut_NAME_OF_YOUR_TEMPLATE.ini) look for COM_FINDER_ADVANCED_TIPS which is on line 439, go to the end of the line and remove all line breaks until HELIX_ULTIMATE_HEADER_STICKY_OFFSET_DESC is line 440, save.
2. open /administrator/language/en-GB/en-GB.plg_system_helixultimate.ini look for COM_FINDER_ADVANCED_TIPS which is on line 347, go to the end of the line and remove all line breaks until HELIX_ULTIMATE_HEADER_STICKY_OFFSET is line 348, save .
This is all to solve the problem with our products, if you have problems with other extensions activate Language Debug in the Joomla configuration, then in the public part in the errors tab you see in which files and lines the errors are found.
Regards