Download of PTH-2A 2.1 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Multimedia Tools, more precisely Music Production.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This software is an intellectual property of OverToneDSP. The most popular versions among PTH-2A users are 2.1, 2.0 and 1.0.
From the developer:
The PTH-2A is a Vintage Program EQ based on the much sought after Pultec EQH units. Similar to the genuine EQH hardware, it is a economical version of the classic EQP-1A. It models the passive EQ circuitry found in such devices, and in addition, the transformer-coupled valve amplifier used to make up the gain after the filters.
You may want to check out more software, such as Jupiter-8V, Psycle or OtsDJ, which might be similar to PTH-2A.