Have you ever ran into a siuation where you go to install AutoCAD and it acts as if it is already installed but is not actually installed. In most cases the Installer rolls back and sets everything back to the way it was before you started the Installer. However in some cases this does not always happen, when you try to install again it acts as though the product is installed.
Resetting the Installer so it does not think AutoCAD is already installed
<<<<<<<<<<make sure to back the Registry up 1st>>>>>>>>>>>>If Aborted
1.) If aborted then search for these paths in the Registry
HKEY_CLASSES_ROOT\Installer\Products
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr?entVersion\Installer\UserData\S-1-5-18\Products
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr?entVersion\Uninstall
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr?entVersion\Installer\UserData\S-1-5-18\Products
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr?entVersion\Uninstall
Under each of these look for your Product Name and remove any keys from the GUID level.
If the log files says there is an existing .MST
1.) If the install log shows that the install initialization is detecting the existence of a .mst file and cannot proceed because the .mst file
1.) If the install log shows that the install initialization is detecting the existence of a .mst file and cannot proceed because the .mst file
is not found in the path listed, then look in the first key above for the string of the .mst file name and delete that key from the GUID level.
If the Log file fails due to custom action
1.) If the log fails due to the custom action, CheckForACADExistance, then browse to the INSTALLDIR, usually C:\Program Files\<Product Name>and remove the <Product Name> directory.
1.) If the log fails due to the custom action, CheckForACADExistance, then browse to the INSTALLDIR, usually C:\Program Files\<Product Name>and remove the <Product Name> directory.
<<<<<<<<<<make sure to back up the Registry up 1st>>>>>>>>>>>>
Warning!
Problems caused by improperly editing the Windows registry could render your computer operating system unusable. Microsoft provides a wealth of
critical information that you need to know about the registry in the Microsoft Knowledge Base athttp://support.microsoft.com/support.
Use the Microsoft® Registry Editor only at your own risk and only after backing up the registry as well as the system.dat and user.dat files as
outlined for your operating system in the Microsoft Knowledge Base and in the related solution. Additional information about the registry is
also contained in the Help topics in the Microsoft Registry Editor.
How to Backup System Registry see TS66513
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