Dear Sir and madam

I have some problem about install your program.

Before I use to use your “Draft sight” (free version)

In 2017, when I delete program to install new version, I could not delete.

At that time, error message showed on screen. (I attach that.)

It says below.

“Error 1721. Installer package has problem.

It could not have presses program to complete this installation.

Please ask support station or package maker.

Uninstall_swinstactsvc.exe.

C:\\Program\\DraftSight\\setup\\i386\\swinstactsvc.

Command:-swup DSP”

When I tried to install latest version (2018’s version)

Please suggest what and how I can do for it.