So far, terrible out of the box experience.
Launching MailSuite from the disk image tells you that you have to move it to the Applications folder... OK. Why didn't they put an alias to the Applications folder right there on the disk image like other products do?
Moving to the Applications folder and launching then offers registration. Ok, I registered with the right button. The left button offers "install" so I clicked, then clicked "Install Full Suite". The app confirmed with "Installation Complete" and "Ok". Pressing OK and then the list of components still show "Not Installed". Pressing "Remove Full Suite" quit mail... but beyond that, did nothing other than flicker. Trying 'Install Full Suite' again just did the same thing. NO JOY. Note that "Install Full Suite" does not offer to relaunch Mail... sigh, not impressed.
Looking at the directions, it seems that you have to drag this into the Security preferences for "Full Disk Access". Can't fathom why the app did not indicate that it needs to be there before proceeding. Manually drug the MailSuite app into the "Full Disk Access" list and started over. NO JOY
Further looking at the directions, they expect a button in Mail preferences under the "General" tab of "Manage Plug-ins…" which is not there. Googling this problem it seems that a hidden Mail preference of 'EnableBundles' has to be set to true or '1'. Note that MailSuite's installer was not smart enough to look in the Mail preferences and see that it was not set and offer to set it. I had to quit Mail, open Terminal and issue the command line:
sudo defaults write "/Library/Preferences/com.apple.mail" EnableBundles 1
to enable the bundles and have the "Manage Plug-ins…" button show in Mail preferences. Using Google to fix installation problems is by definition a poor out of the box experience.
After doing all this, then launching MailSuite, it still fails to install anything. The 'Install Full Suite' button remains impotent.
So now I have a support ticket in to just get this installed. I should have downloaded the time-bomb version and gone through this before dropping my money on the product, silly me. If you buy this product similarly, silly you!