I hired a developer from Joomlancers, OSSolutions, to modify the forms for DT Register. The program was working well before he began, I just wanted him to change fonts on forms, add a line of text to forms and have users registered on site, not just in DT Register Registration records.
We have mutually agreed to discontinue working together but in the meantime, the program is now not working at all.
I contacted Tuan to advise DT Register program now not working at all. He told me that it is because he removed the modifications he made while working on project and did not restore to original settings.
You should extract the files from your download file (make sure it is the most recent download - maybe download it again to be sure), then manually load the files over top of the ones that have been messed up.
For modifying font styling, you can do this easily in the main.css file found in:
/components/com_dtregister/