There is a known issue with installing MasterCook onto a NAS system.
In the meantime, please contact MasterCook Support. One of our developers would be happy to have a remote session with you to install the program for you. Otherwise you can use a workaround to help resolve this known issue with a registry tweak.
If only the user files have been stored on NAS there are two registry entries that need to be adjusted accordingly.
Registry entry 1 : HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\MasterCook\MasterCook 20\DocPath
Registry entry 2: HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\MasterCook\MasterCook 20\ToolsPath
Their values will have originally resolved to the actual NAS path, for example Y:\\TROUT-NAS\SERVER-NAME\MC2020\UserFiles\MasterCook 20 (It will be an unusual long drive name). You will need to simply edit it to say Y:\MC2020\UserFiles\MasterCook 20 (Simply the drive letter Y: followed by the folders you have it in)
Similarly, for the toolsPath registry key you will need to edit it to simply say Y:\MC2020\UserFiles\MasterCook 20\MC Tools (Simply the drive letter Y: followed by the folders you have it in)
If you have the program files also stored on a NAS then there is one more registry entry to tweak.
After these edits have been made, launch MasterCook and it should work as expected. Otherwise, don't waste any time. Just contact MasterCook Support for help, and we will help you ASAP.