Old version. Full Installer for PCM II 2.1a . Patch notes can be read below
Some days ago, a critical bug was found in the variable system introduced in PCM II: if a game was saved and later restored, all of the variable info would be lost and would not be able to be restored. Therefore, the main purpose of this update is to fix this bug. Since the save game file format had to be changed in order to fix this bug, PCM II 2.1a won’t be able to open games saved in 2.1 or 2.0.
Additionally, the maximum number of possible variables has been increased to 256 (thanks to JustTesting1234, for suggesting), and the useless option to “Extend Population Cap to 1000” has been removed from the installer.