# Installation of node-red-contrib-modbus fails

**URL:** <https://discourse.nodered.org/t/installation-of-node-red-contrib-modbus-fails/37873>\
**Category:** General\
**Created:** [22 December 2020 11:20 UTC](https://discourse.nodered.org/t/installation-of-node-red-contrib-modbus-fails/37873 "2020-12-22T11:20:54Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![jcs](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jcs](https://discourse.nodered.org/u/jcs)\
**Post date:** [24 December 2020 11:04 UTC](https://discourse.nodered.org/t/installation-of-node-red-contrib-modbus-fails/37873/8 "2020-12-24T11:04:03Z")

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Hi Steve,

I have tried it again:

Installing the windows build tools with administrative rights...

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/d/bdddcf5283ac2c20bb3310c065f6a62e6720673e.png)

and then executing

'npm install -g node-red-contrib.modbus --unsafe-perm --build-from-source'

...I have been able to load the flow again.

Thank you very much!

Best regards,

Jaume Cañas

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