# Bye Catalina, Hello Big Sur

**URL:** <https://discourse.shapr3d.com/t/bye-catalina-hello-big-sur/11273>\
**Category:** Modeling Questions\
**Created:** [February 5, 2021, 1:21pm UTC](https://discourse.shapr3d.com/t/bye-catalina-hello-big-sur/11273 "2021-02-05T13:21:32Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![KPeter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/kpeter/32/7644_2.png) [@KPeter](https://discourse.shapr3d.com/u/KPeter)\
**Post date:** [April 12, 2021, 11:47am UTC](https://discourse.shapr3d.com/t/bye-catalina-hello-big-sur/11273/6 "2021-04-12T11:47:07Z")

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Hello @andrew, no worries 🙂 Yes there is a reason, please take a look at this thread:

> [@OS version query](https://discourse.shapr3d.com/t/os-version-query/11142/4):
>
> Yes, the reason is purely technical. Shapr3D for mac is running on [Catalyst](https://developer.apple.com/mac-catalyst/), which is in a poor shape on Catalina, and not available on Mojave unfortunately. If we see significant demand for supporting older macOS versions, we will do it, but that would mean that we have to rewrite the UI from scratch, which does not sound like a reasonable investment, especially considering that most likely the M1 macs will gain very significant market share over the next couple of years. Another issue is that …

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