Hi turnbull,
Would you please try with the following steps and see if it helps:
1) Manually removed Fusion completely and then executed the below commands in Terminal window on Mac Host:
xattr -l ~/Downloads/VMware-Fusion-10.0.0-6665085.dmg
xattr -dr com.apple.quarantine ~/Downloads/VMware-Fusion-10.0.0-6665085.dmg
2) Reinstalled VMware Fusion from the dmg
Sorry for any inconveniences,
Regards,
-Rick