Hi, I had the same problem. In my case source of the problem was licensing service installed with Draftsight. It's called FlexNet Licensing Service, and I already had it installed earlier with Adobe Photoshop.
Try to:
- Check if You also already have this service installed, if yes You've got to find out which software is using it.
- Temporarily uninstall another software using this service.
- Reinstall Draftsight and try to activate it - there shouldn't be any problem now.
- Reinstall the other software that used this service.
Is DraftSight Free? The standard version of the software is available to download and use and comes complete with a wide range of useful tools.
Draftsight Free Cad Software
Draftsight Free 64
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