Unable to update core from 2.2.20 to 2.2.35

First, when I tried to update by pressing the "Update" button inside the software, it would download the update but then hang at 40%.

Support suggested trying it from a console with:
artisan update core 1 2.1.35

But that gets:
Downloading update...
Not able to download core

I put it in a CRON job every 15 minutes to see if it was a busy server problem, its been trying to update for 2 days, save error every time!

What can I try next?

Argh! I typoed the version numbers in the title and do not see a way to edit it!

I am running 2.1.20, trying to update to 2.1.35!

Tried the update:all command with -vvv debug, got this:

Starting update...
Updating core...
The command /usr/local/bin/php artisan update core 1 failed.

Exit Code: 1(General error)

Working directory: /home/visrico/public_html/erm

Output:
================
Not able to get the latest version of core!


Error Output:
================

Not able to update core!

Same error, just more verbage.

same here, its stuck at 20%

for me I over write the files with version 2.1.25 files

Did that work? I thought about it, but I set up a new instance of 2.1.35 and started porting my data over. I discovered they added fields, such as splitting "address" out into "city", "state", etc. I dealt with that for the simple 1-table DBs. But things like "Invoices" are composed of at least 2 Dbs.