[v2.6.6]

Fixed an issue where, during Auto Theory, upgrades would always reference and level up based on the cost of one level. - Fixed an issue where Theories would incorrectly increase by 100 levels despite insufficient funds. - Corrected a problem where a loop in Theory Automation would persist after loading the game. - Fixed a bug where Steam Achievements related to the letters r and z could not be obtained. - Corrected an issue where the Drunk Challenge would fail upon Prestige. - Addressed a problem in the Square Root Challenge where Battle Upgrade 52 was incorrectly influencing the challenge. - Modified the content of Tier 11 (T11) to now include the unlocking of the Exponentiation Challenge. - Updated the export function to correctly reflect the version number.