Starting from version 3.3.00, you can define the MOD version in the MOD header file.
http://www.capitalismlab.com/how-to-make-a-mod.html
The MOD text file should be formatted like this:
[MOD]
Title=<The MOD title>
Version=<The version of the MOD>
Description=<the description text>
Author=<The author of this MOD>
The following are optional lines:
Add Seaport Product=<Product Type>
(Supported in version 3.1.00 or later. You may assign multiple products using the same syntax, like the below example. )
Maximum Product Price=<a value between 20000 and 100000>
(Supported in version 3.1.02 or later. If you intend to create a MOD containing products with standard prices higher than $20000, then you will have to use this statement to set the maximum product price allowed in the game to a value higher than $20000.)
Example:
[MOD]
Title=My Capitalism Lab MOD
Version=2.5
Description=This is my first MOD for Capitalism Lab
Author=Capitalism Person
Add Seaport Product=Steel
Add Seaport Product=Plastic
Maximum Product Price=50000