http://downloads.universal.nl/klanten/software/ms/office/crm/CRM2016-Client-ENU-amd64.exe 64-bits version
http://downloads.universal.nl/klanten/software/ms/office/crm/CRM2016-Client-ENU-i386.exe 32-bits version
Please install the version identical to your Office installation.
If using Office in the 32-bits version, then you should install the 32-bits version of the CRM Plugin. If using the 64-bits Office installation; then download the 64-bits Outlook Plugin.