While this problem seems to be a little different than mine, I wanted to post my solution for those who might still be having trouble and looking for other things to try and fix their Draftsight 2018 problems.
My issue involved Draftsight not being able to install. It would crash when it tried to register a DLL with regsvr32.
Noneof Yourbussines posted a solution on another thread about installing the 2015 C++ redistributables, but I had both of the VS 2015 C++ redistributables installed already. Repairing them didn't work either. After re-evaluating the error message (like Kalle Mikael the error message said it was unable to register a DLL using regsvr32) I deduced that maybe there was a problem with the x86 (32bit) version of the VS 2015 C++ redistributables. So I
- downloaded the VS 2015 C++ Redistributable package from Microsoft download
- then I uninstalled the x86 version
- then re-installed it.
After that I was able to install Draftsight 2018 SP2 without any problems, as well as some other software that was giving me fits!