If I try to load your save in my BtS by double clicking it, I get the "Invalid Mod directory - ignoring" error, because your save contains a full path name: ModPath="C:\Program Files (x86)\Steam\steamapps\common\Sid Meier's Civilization IV Beyond the Sword\Beyond the Sword\Mods\BUFFY-3.19.003\". That path doesn't exist on my system because (a) I don't have a 64 bit system, so no C:\Program Files (x86), and (b) I don't have the Steam Civ4 release.
So I created the entire folder path that BtS is looking for, and put a copy of BUFFY in it. I was then able to load your save, complete with the BUFFY mod and its interface. But I get a similar warning to yours in the Settings screen. Mine says: "BUFFY must be installed to C:\Program Files\2K Games\Firaxis Games\Sid Meier's Civilization 4 Complete\Beyond the Sword\Mods". This is the path containing my live BUFFY mod, so it is objecting to the fact that the save has loaded a copy of the mod that isn't in its own Mods folder. I DON'T get the CRCs are missing error, though.
Note that the BOTM start saves contain ModPath="Mods\BUFFY-3.19.003\" which doesn't contain a fully qualified path. That path should exist relative to your BtS executable regardless of which version you have installed. I don't know why your save contains a fully qualified path. I imagine you would have problems sharing saves with anyone who doesn't have exactly the same Steam/BtS installation structure on their C drive.
[PS] For reference: My Windows BtS is a DVD Civ4 Complete installation in a Windows XP SP3/Parallels virtual machine.
So I created the entire folder path that BtS is looking for, and put a copy of BUFFY in it. I was then able to load your save, complete with the BUFFY mod and its interface. But I get a similar warning to yours in the Settings screen. Mine says: "BUFFY must be installed to C:\Program Files\2K Games\Firaxis Games\Sid Meier's Civilization 4 Complete\Beyond the Sword\Mods". This is the path containing my live BUFFY mod, so it is objecting to the fact that the save has loaded a copy of the mod that isn't in its own Mods folder. I DON'T get the CRCs are missing error, though.
Note that the BOTM start saves contain ModPath="Mods\BUFFY-3.19.003\" which doesn't contain a fully qualified path. That path should exist relative to your BtS executable regardless of which version you have installed. I don't know why your save contains a fully qualified path. I imagine you would have problems sharing saves with anyone who doesn't have exactly the same Steam/BtS installation structure on their C drive.
[PS] For reference: My Windows BtS is a DVD Civ4 Complete installation in a Windows XP SP3/Parallels virtual machine.