# Manual 4.0.1 to 4.0.0 reversion?

**URL:** <https://forum.kirupa.com/t/manual-4-0-1-to-4-0-0-reversion/299111>\
**Category:** flash\
**Created:** [October 29, 2009, 10:26pm UTC](https://forum.kirupa.com/t/manual-4-0-1-to-4-0-0-reversion/299111 "2009-10-29T22:26:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![AlexWD](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@AlexWD](https://forum.kirupa.com/u/AlexWD)\
**Post date:** [October 29, 2009, 10:26pm UTC](https://forum.kirupa.com/t/manual-4-0-1-to-4-0-0-reversion/299111/1 "2009-10-29T22:26:23Z")

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I attempted to update to 4.0.1, there was some kind of error and now many things are messed up. Essentially because of missing DLLs, the irony being that I figured out the problem and it wasn’t related to the update at all. Is there any way that I can revert back to version 4.0.0 manually? Because I still have the 4.0.0 folder with all the required dlls and such…