If you are missing Heidi, you can find the DLL here.Try running your application, with luck it will run first time!!.
You need to first download and install The Longbow Converter.If you accept that we are not liable, then you can read on - here's what you need to do. Before you try this, be aware that unless you know what you are doing you can severely break your Windows installation - we are not responsible for your mistakes and state that we are not liable. If you can't use the installer and you absolutely must run your AutoCAD on Windows 64bit, then it is possible to make it work, but it needs some real computer skills to make it work. The reason they cannot work is because Windows only supports dual modes for the target platform, that is, for Windows 64bit only 32bit and 64bit apps are supported, not 16bit - so for instance the 16bit AutoCAD 2000 installation program cannot run. That said, Windows 32bit supports 16bit and 32bit, not 64bit - so the 16bit AutoCAD 2000 installation program *can* run. The problem with some versions is that the installation program is a 16bit program, and 16bit programs cannot work on Windows 7, 8, 8.1 and Vista 64bit. Older versions of AutoCAD are all 32bit applications which means that it is totally capable of running on Windows 7, 8, 8.1 and Vista 64bit. Important Update! Users of AutoCAD R please read these updated AutoCAD R installation instructions (look just above here) instead of the following:
How to manually copy an AutoCAD install from an XP machine to a Windows 7 64bit, Windows 8 64bit, Windows 8.1, Windows 10 or Windows Vista 64 bit and make it work! (Advanced users only)
You need to first download and install The Longbow Converter.If your version is not listed there, then.
Tip : Before you start, specific instructions for your version of AutoCAD may already be documented at our Longbow Software Blog - (check out the 'Categories' listed on the left). Be sure to carefully follow all the instructions below. NOTE: Installing these versions of AutoCAD is a 2 step process, so once installed, be sure to read the next step! First step is installing, second step is getting the installed program files working.