# Installing Psychopy 1.85.3

**URL:** <https://discourse.psychopy.org/t/installing-psychopy-1-85-3/16160>\
**Category:** Coding\
**Created:** [September 2, 2020, 11:40am UTC](https://discourse.psychopy.org/t/installing-psychopy-1-85-3/16160 "2020-09-02T11:40:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![GioP](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/giop/32/5851_2.png) [@GioP](https://discourse.psychopy.org/u/GioP)\
**Post date:** [September 2, 2020, 11:40am UTC](https://discourse.psychopy.org/t/installing-psychopy-1-85-3/16160/1 "2020-09-02T11:40:52Z")

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Dear all,

I developed my experiment using Psychopy 1.85.3. Unfortunately, the IT upgraded Psychopy to version 2020.1.2.

I tried to install again a previous version by using this code in the .py file:

```auto
import psychopy
psychopy.useVersion('1.85.3')

```

However, this only works with python3 versions of Psychopy, as it can be seen from the error I get:

```auto
6.0460 ERROR Please request a version of PsychoPy that is
compatible with Python 3. You can choose from the following versions: 
['latest', '3.2.4', '3.2.3', '3.2.2', '3.2.1', '3.2.0', '3.2', '3.1.5', 
'3.1.4', '3.1.3', '3.1.2', '3.1.1', '3.1.0', '3.1', '3.0.7', '3.0.6', 
'3.0.5', '3.0.4', '3.0.3', '3.0.2', '3.0.1', '3.0.0', '3.0', '2020.2.3', 
'2020.2.2', '2020.2.1', '2020.2.0', '2020.2', '2020.1.3', '2020.1.2', 
'2020.1.1', '2020.1', '2020', '1.90.2', '1.90.1', '1.90.0', '1.90']. 
Alternatively, run a Python 2 installation of PsychoPy < v1.9.0.

```

So, how can I go back to version 1.85.3?

---

<div class="post-metadata">

**Author:** ![TParsons](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/tparsons/32/8301_2.png) [@TParsons](https://discourse.psychopy.org/u/TParsons)\
**Post date:** [September 3, 2020, 8:46am UTC](https://discourse.psychopy.org/t/installing-psychopy-1-85-3/16160/2 "2020-09-03T08:46:10Z")

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In order to run 1.85.3 you would need to downgrade your version of Python itself from 3 to 2, however what breaks in your experiment when you upgrade to the latest version of PsychoPy? It might be easier (and certainly more futureproof) to update your experiment