Sage recommends installing your software directly at the server. Afterwards, the server has special registry entries, and the directory ..\MAS90\Uninstallation Information\ contains the names of modules and the specific location of the installation software.

Therefore, beginning with version 4.00, Sage 100 requires reinstalling or upgrading at the same machine where the original installation was performed. If an upgrade or reinstall is performed from a different machine, the following issues may occur. 

• The upgrade or reinstall may appear to be a new installation.
• Product registration information must be re-entered
• Custom Office files and directories may be deleted
• If a single module is installed, other modules may no longer be accessible
• CRC errors or similar error occur

Note: If the original machine is no longer available or you must move Sage 100 to a new location, or if the original machine is no longer available, see the DocLink How to move or migrate Sage 100 to a different server, hard drive, or directory.

1. From the server, access the disc media or downloaded image.
   • Note: As of version 4.50, downloads for currently supported versions are only available from the Sage Knowledgebase (you must be logged in) at https://support.na.sage.com. Disc media are no longer manufactured. Also, download files for retired versions are not available on the Sage Knowledgebase.
2. Execute Autorun.exe if auto start does not open
   • Right-click Autorun.exe, select Run as Administrator
3. Select the Sage 100 product to install.
   • Note: Regardless of the edition (Standard, Advanced, or Premium; 100 or 100c) selected, the product keys entered will determine which edition is actually installed.
4. The InstallShield Wizard opens with Existing Installed Instances Detected window
5. Select Maintain or update the instance of this application selected below: option
6. Select the instance under the Display Name then click Next
   • If the Existing Installed Instances Detected message does not open , InstallShield is not recognizing this machine as the original installation location
   • Locate the original machine,see the DocLink How to move or migrate Sage 100 to a different server, hard drive, or directory
7. Modify Installation window opens select Add or Reinstall, then click Next
   • Selecting Add prompts for Product Key
   • Click Yes and enter new product key if available.
   • If No is selected, the non-registered module(s) will install and will be accessible for 45 Days. Note: DO NOT INTEGRATE any of your existing modules with the non-registered modules unless you plan to purchase the module(s).
   • Some modules such as Visual Integrator, Customizer, and eBusiness Manager do not allow the 45 day trial period
8. Select the modules(s) to Add or Reinstall, click Next
   • Note: If the application module that you are attempting to add is not listed as available to add, and that application module is truly not installed, and the product keys should allow that application module to be added, you may try instead to select a Repair Reinstall with the new product keys received, instead of Add Module installation.
9. Start Installation opens. Review Current Settings for accuracy before clicking Install
   • Target Directory
   • Estimated Required Disk Space
   • Estimated Available Disk Space
   • Selected components to install
10. When installation completes, InstallShiledWizard windows opens "All Service Packs and Product Updates will need to be reinstalled" click OK
11. Install latest updates
12. Open Sage 100 and test system. Some update required company data conversion. Convert data as required.

Additional information

• If upgrading to the current version is not successful, perform incremental upgrades to identify the issue.
• When upgrading from DOS version 3.2x, first upgrade to version 3.31, and then upgrade to version 3.71 (upgrading to version 3.51 first may be required).
• For versions earlier than 3.71, create a test environment to perform the upgrade, and identify any conversion errors or missing data.
• The lowest level to upgrade to current (4.30 or higher) is version 3.71.
• Remove the modules that are not being used.
• Remove the modules that have been activated but not set up, the modules can be reactivated in the current version.
• Remove *.old or *.bad files from the ..\MAS90 directory.
• Remove any file or folder not standard to Sage MAS 90 from the ..\MAS90 directory.
• Rebuild all key files for all modules. refer to article ID 17965, DocLink: How to Rebuild Key Files

Additional Information for Sage Extended Enterprise Suite (EES), which includes Sage CRM:

If adding a new module to Sage 100, follow the normal steps for adding a module for Sage 100. If you add new user licenses to EES you may also need to update the license in Sage CRM.

To accomplish this, follow the instructions below:

1. Use the EES installation disk
2. Select Install CRM Server
3. Select New Installation
4. Install Shield invokes, "..install Sage CRM Server..", click Next
5. Select Change existing install of CRM
6. Select only the License Key component
7. Key in new license key.

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Note: Sage 100 2013 and later versions use the Microsoft installer MSI which has different options when reinstalling.

1. Add Module: Change which program features are installed. This option displays the Custom Selection dialog in which you can change the way features are installed.
   • Install module not previously installed
   • Add new module based on new product key
2. Reinstall: Repair installation errors in the program. This option fixes missing or corrupt files, shortcuts, and registry entries.
   • Re-installs all previously installed modules.
   • Option to reinstall all Demo Data
   • Note: There is no option to select specific modules or specific demo companies when reinstalling. It will reinstall all previously installed modules and all demo companies if selected.