Not sure what you're doing there, so here is step by step how I do it on my device:
1) The link on the Android Forums app (assuming that's what you use):
2) After clicking on the link, I get this:
3) Selecting Chrome, I now get that:
4) Selecting Chrome again, I now get the Google Drive page as it would show up on a PC:
5) Tapping on Download, I now get asked to pick between Chrome and Drive again:
6) Selecting Chrome again, I (somehow) get asked again to pick between Chrome and Drive. Selecting Chrome again, the file is downloaded:
7) I open Tasker and tap and hold on the Home button:
8) Selecting Import, I'm shown Tasker's file browser:
9) The folder is empty because I deleted the previous file. You might still have it left there. Ignore it. I tap the Left arrow to go back to the Tasker folder. I get this:
10) Tapping the left arrow again, I get this:
11) Tapping on Download, I get:
12) Selecting the file (there may be more than one in your Download folder), it is now imported:
