The help files for CR for VS2010 can be found on http://help.sap.com under All Products > SAP BusinessObjects > CR for Visual Studio
The packages need to be placed in the same folder as the product.xml file. This solution is also mentioned in this forum post by Mandeep: CRVS2010 Beta – Error: Download prerequisites from same location as my app
1. In the following folder, you will find a product.xml file.
\Program Files\Microsoft SDKs\Windows\v7.0A\Bootstrapper\Packages\Crystal Reports for .NET Framework 4.0\
2. Open the product.xml file in Notepad (or any text editor) and under the section, you will find 2 URLs that point to the 2 deployment packages. Copy each URL into your web browser and manually download the packages.
3. Once the packages are downloaded, copy them to the same folder as the product.xml file (see #1 above).
You should now be able to re-build and re-publish your ClickOnce deployment.