# Problem (Re)installing Particle Workbench

**URL:** <https://community.particle.io/t/problem-re-installing-particle-workbench/52432>\
**Category:** Troubleshooting\
**Created:** [September 30, 2019, 4:46pm UTC](https://community.particle.io/t/problem-re-installing-particle-workbench/52432 "2019-09-30T16:46:54Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mprogers](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/mprogers/32/18458_2.png) [@mprogers](https://community.particle.io/u/mprogers)\
**Post date:** [September 30, 2019, 4:46pm UTC](https://community.particle.io/t/problem-re-installing-particle-workbench/52432/1 "2019-09-30T16:46:54Z")

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I’m in the process of upgrading computers, and while I’ve installed Particle Workbench, I seem to be missing some pieces. I tried flashing a program and got this error:

dyld: Library not loaded: /usr/local/opt/libusb/lib/libusb-1.0.0.dylib  
Referenced from: /Users/me/.particle/toolchains/buildtools/1.1.0/dfu-suffix  
Reason: image not found

I don’t seem to even have /usr/local/opt on this machine, let alone libusb installed it.

I could copy it from my old computer, but I’m wondering what I (or the Particle Workbench installer) did wrong that caused it to be missing from my new one.

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**Author:** ![ParticleD](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/particled/32/17016_2.png) [@ParticleD](https://community.particle.io/u/ParticleD)\
**Post date:** [September 30, 2019, 5:01pm UTC](https://community.particle.io/t/problem-re-installing-particle-workbench/52432/2 "2019-09-30T17:01:53Z")

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Is this Linux or OS X?

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<div class="post-metadata">

**Author:** ![mprogers](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/mprogers/32/18458_2.png) [@mprogers](https://community.particle.io/u/mprogers)\
**Post date:** [September 30, 2019, 6:02pm UTC](https://community.particle.io/t/problem-re-installing-particle-workbench/52432/3 "2019-09-30T18:02:20Z")

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Good point. macOS (Catalina).

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**Author:** ![mprogers](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/mprogers/32/18458_2.png) [@mprogers](https://community.particle.io/u/mprogers)\
**Post date:** [September 30, 2019, 7:13pm UTC](https://community.particle.io/t/problem-re-installing-particle-workbench/52432/4 "2019-09-30T19:13:22Z")

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Update: Based on [this discussion](https://github.com/platformio/platformio-core/issues/596), I installed libusb and now all is well.