C# option missing on installed studio

They removed it in october 2019 C# Support Temporarily Removed in Studio 19.10

We want to reassure you this is temporary - we have heard loud and clear that you want the option to use C# in UiPath Studio projects. C# will be re-enabled in next month’s Community update. You can get support back sooner if you opt into our Preview channel (go to the Help tab and choose the “Preview” channel radio button on the right side).

They said it would be re-enabled again in the next community edition. but it doesn’t look that way yet.
Lot of people are waiting for an update on that.