In the late 2000s, a single Mplus license cost hundreds of dollars — prohibitive for students and researchers in low-income countries. Some turned to cracked or shared copies of version 6.12, often shared on academic forums or peer-to-peer networks. These unauthorized copies:

For everyone else, embrace the present. Use the free Mplus Demo (latest version) for learning, or invest in a modern base program license. Your future research (and your sanity) will thank you.

R packages

If you cannot afford Mplus, these can perform the same "Combination Add-on" analyses (MLM, SEM, Latent Class): lavaan : The industry standard for SEM in R.