Ender_kitten2, The downloadable version of vox-l is alot newer, and it's much easier for Development to implement fixes on it rather than the entire site - they're still planning to update the vox-l simulator that run in the web browser, though, soonish.
Try downloading the Vox-L game from the Artifacts shop; get there by clicking the red square on the LearnToMod homepage. Doing this will most likely solve the problem. To buy this artifact, you'll need to complete one or two Quests ; get to Quests by clicking the wheel icon in the upper right corner; if for some reason you can't unlock a Quest, you can always press the Skip Quest button to proceed to the next one.
At the Artifacts shop, you can filter the results by clicking the purple filter tags in the corner. The Vox-L game should be the first thing you can buy.
I'll add some quest points to your account so you can do that,
If the downloadable version doesn't work, please let me know.