By default, the RP1Cloud Outlook Plug-In is a 32-bit version. But you might require the 64-bit version. As a first step, you'll want to confirm which version of Outlook you are running. This can be done in 3 simple steps!
Step 1 - When you are in Outlook, click the File menu.
Step 2 - You'll then click the Office Account option.
Step 3 - The next step is to click the About Outlook button
You will then see detailed information about the version of Outlook you are using and the information highlighted in blue will tell you the bit version of your Outlook. In this case, it's 32-bit.
If your version of Outlook is the 64-bit version, please click https://rp1cloud.com/plugins/RP1Cloud-Outlook-Add-In-64bit.msi and install the plug-in. The installations steps are explained in this helpful article.