I also can't launch MasterPlan:
System Version: macOS 10.15.7 (19H15)
Model Name: MacBook Air
Model Identifier: MacBookAir8,1
Processor Name: Dual-Core Intel Core i5
Processor Speed: 1.6 GHz
ndnd:masterplan-masterplan-mac-release arya$ open -a MasterPlan.app
LSOpenURLsWithRole() failed for the application /Users/arya/Downloads/masterplan-masterplan-mac-release/MasterPlan.app with error -10810.
From Console.app:
default 09:00:58.872500-0500 lsd SecTranslocateCreateSecureDirectoryForURL: created /private/var/folders/gb/9rclsj6n3clbzpcv0svycf0h0000gn/T/AppTranslocation/C8C6ADFD-62F0-46D3-A0B9-3A4D27564702/d/MasterPlan.app
default 09:00:59.121500-0500 open LAUNCHING:0x0-0x5116a119 MasterPlan foreground=1 bringForward=1 seed=2683 userActivityCount=0
default 09:00:59.230818-0500 runningboardd [executable<MasterPlan(501)>:15656] Death sentinel fired!
default 09:00:59.244216-0500 loginwindow -[PersistentAppsSupport applicationQuit:] | for app:MasterPlan, _appTrackingState = 2
default 09:00:59.244270-0500 loginwindow -[PersistentAppsSupport applicationQuit:] | App: MasterPlan, quit, updating active tracking timer
default 09:00:59.337461-0500 runningboardd Removing process: [executable<MasterPlan(501)>:15656]
default 09:00:59.338620-0500 runningboardd Removing assertions for terminated process: [executable<MasterPlan(501)>:15656]