What do you mean by slip-streaming an MSP file?  When you install Microsoft Dynamics GP, in order to install directly to a needed version/build, you can slip-stream the MSP instead of having to apply one version of the GP application, then having to apply an MSP file patch on top of the new install, to get to the version/build that you need.  Saves you time and time equates to $$$$ savings.

Example:

Dynamics GP 2018 R2 DVD, which is version/build 18.00.0628, but you need to install and be on 18.00.0727.

What you can to install Microsoft Dynamics GP directly at the 18.00.0727 is the slip-streaming process:

1. Extract the Dynamics GP 2018 R2 DVD and within the DVD, there will be an 'Updates' directory which, in this example, will have the MicrosoftDynamicsGP18-KB4458410-ENU.msp file in it, which is the patch file for 18.00.0628 or GP 2018 R2.

2. Download the MicrosoftDynamicsGP18-KB4518792-ENU.msp patch file, which is the file for 18.00.0727 for GP 2018 R2.

3. Remove the MicrosoftDynamicsGP18-KB4458410-ENU.msp file from the 'Updates' directory in the GP 2018 R2 DVD, and replace it with this MicrosoftDynamicsGP18-KB4518792-ENU.msp patch file.

Now, when you click Setup.exe to launch the install of Dynamics GP 2018 R2 from this DVD, it'll install it directly at the 18.00.0727 build, not the default 18.00.0628 build.

This is recommended because
A) It saves time having to apply a secondary patch on an existing Dynamics GP installation
B) There is less change of dictionary issues such as the dictionary becoming damaged/corrupted or not accepting the new version during the update, when the dictionary files are installed directly at the newer version and build.

**NOTE: For Web Services on the new Microsoft Dynamics GP / 18.2.xxxx version, you MUST slip-stream the service pack during the install/upgrade of Web Services, otherwise the Web Services Configuration Wizard will give an error and not allow you to continue the process on the GP databases.

Applying the patch for Web Services onto an existing install also will not work, the patch must be slip-streamed with the install.

To do this, you'll need to install the KB4527536 patch for Web Services 18.2.xxxx from the CustomerSource or PartnerSource page, then, in the MDGP_DVD_ENUS for Microsoft Dynamics GP /18.2.xxxx, go into the 'AdProd' directory, then 'WebServices', choose either x64 or x86, then in the 'Updates' folder for Web Services, remove the existing MSP file and replace it with this KB4527536 patch. Use the Setup.exe under MDGP_DVD_ENUS > GreatPlains > AdProd > WebServices > x64 to launch the Web Services install/upgrade to 18.2.xxxx version.

Hopefully this slip-stream information will save you some time with your upgrades and installs and lead to less issues with dictionary files and that area.

Thanks everyone and happy upgrading!!