# Multiple software revisions
**URL:** https://forum.deltamotion.com/t/multiple-software-revisions/929
**Category:** RMCTools
**Created:** [August 11, 2021, 1:04pm UTC](https://forum.deltamotion.com/t/multiple-software-revisions/929 "2021-08-11T13:04:30Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Wnewton](https://forum.deltamotion.com/u/Wnewton)
#### Post date: [August 11, 2021, 1:04pm UTC](https://forum.deltamotion.com/t/multiple-software-revisions/929/1 "2021-08-11T13:04:30Z")
Greetings,
Over the years our company has installed a couple different RMC motion controllers with different revisions of RMCTools software. The most recent is 4.18.4. The RMC200 I need to connect is running 4.13.x and I’m curious if the software is backwards compatible and can I run multiple versions on the same PC/laptop in a similar fashion to multiple revisions of RSLogix. If not how can I download older versions of RMCTools as the downloads page of the website only has 4.18.4 available.
Please advise.
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### Author:  [@dmcnichol](https://forum.deltamotion.com/u/dmcnichol)
#### Post date: [August 11, 2021, 8:43pm UTC](https://forum.deltamotion.com/t/multiple-software-revisions/929/2 "2021-08-11T20:43:21Z")
Our software is backwards compatible so you should be just fine running the latest version! Here’s our release notes if you’d like to see what has changed: [RMCTools Release Notes](http://deltamotion.com/files/rmctools.html)
Also if you do end up needing an older version of RMCTools contact [support@deltamotion.com](mailto:support@deltamotion.com) and we’ll send what you need right over, you’ll be able to run multiple versions without issue.