Hello Glenn,
First of all, we do recommend that you use the tool 'Help -> S32DS Extension and Updates' instead of the Eclipse 'Install New Software' to install the packages.
Second, all of the packages are available for download from the Flexera site so they could be installed offline. This can be done as follows:
1) Login to your account on NXP.com
2) Select 'Apps and Services' from the menu to the left.
3) Select 'Sofware and Licensing' from within the Licensing section
4) Select 'View Accounts' under Software Licensing
5) If you have multiple accounts, select the appropriate one. Otherwise, skip to next step.
6) You should now be on the Product List page. From here you can use the following link:
https://nxp.flexnetoperations.com/control/frse/download?agree=Accept&element=13592207
7) Download the file: SW32_S32DS_OfflineDevPack_3.5.0_D2207.zip.zip
From within S32DS Extensions and Updates menu, select 'Add Update Sites' (blue linked text at the bottom of Overview) and then locate and select the file from previous step.
Best Regards,
Mike