Sorry - Just saw your message. Yes, I am a freelance designer and fortunately my clients do pay me! If you are interested, you can reach me at gspeer@cortech.org or Skype at g_d_speer
For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.