We are reaching critical mass here - first we have to remain on Joomla 3.x and PHP 7.4 for DT Register to work, while support will soon be ending for both.
I don't know what your customer base is for DT Register (or DT Donate, which some of my clients also use), but things are breaking down:
- One client's PayPal payments were not recorded in the database at all - they had to rely on email confirmations to know who registered and paid.
- I'm currently helping a client who tried to open a registration record on the Records page and could not leave it - when she did, all the registration data was erased!
DT Register is breaking down, with more and more issues arising - likely conflicts with other extensions that have been updated and Joomla updates in the 3.x version.
If you can't at least get a maintenance release out to deal with all these issues, I suspect people are going to have to find another solution for events management. No one wants to have their clients experiencing all these problems.