Modkit Link for Mac OSX fails on install

I’m a new parent to Vex and robotics and am trying to get the Modkit software installed on my MacBook to start interacting with the robot but it fails on the installation of Modkit Link.

The software shows as installed in the Applications window even though the installation process complains as having failed. When I start Modkit though to start editing code I get constant nag alerts that Modkit Link isn’t running and to please start it. Specifically trying to start Modkit Link also does not work (no icon showing on my tool back above.).

I am running 10.13 (but also ran into this problem with 10.12). Any ideas?

EDIT: I figured it would be useful to add that I am trying to install ModLink 2015_04_02


Jeff H

  • I am having the exact same problem!*

I’m having a very similar problem. I have downloaded and installed ModKit link, but the application does not launch when started from the finder. FWIW I am running MacOS High Sierra 10.13.1

I am having this exact problem as well and my students are very keen on testing out their programs after putting in a few months of building time! Please assist!

I have the same problem. What I noticed is that Modlink stopped to work after an OS update.

Has anyone gotten any answers from Modkit? This is extremely disappointing.
Programming Skills.pdf (20.3 KB)
Robot Skills.pdf (22.2 KB)

I was able to get ModKit working with the same Vex device using a mac that hasn’t been updated to High Sierra, which makes me think the OS version is the root cause.

Hi all,

We have a new release of Link that should fix the issue people are seeing on recent Mac OSX versions. This should work for both the online and standalone versions of Modkit for VEX. To try the fix, you should uninstall the previous version of Modkit Link (go to applications folder and move to trash) and then install this one:

If you are using the standalone version of Modkit for VEX, you must complete this step after you install Modkit for VEX as it will install the older version of Link and overwrite this one.


What is supposed to go in the ‘license string’ fields when Modkit is opened for the first time? We purchased the Vex IQ robot kit with grant from Techpoint 4 Youth Indianapolis. I don’t recall any license key published.

Is there also a download for a new version of the PC version of link? I am having the same problem.

tmaltbie, did you ever get a ‘license string’? I’m in the same situation - have purchased several kits but no clue as to what or where to find the license string. I’ve logged into our account as suggested on the modkit download page, but fail to find any license key there either.

When you log into the VEX site and are looking at the dashboard, click My Downloadable Products on the left hand side and then download the PC or Mac version of Modkit from there.