TOPD X-70 for Silicon” is damaged and can’t be opened. You should move it to the Trash
In my opinion, Apple provide fantastic operating systems and I really admire the steps that they take to keep everything safe. It is however, a bit of a pain if you’re developing software because of the rapid pace of change in relation to signing. I am not signing software but I am also not providing download links directly on my site. I am using a webform to request Microsoft OneDrive links. I appreciate that it takes longer to gain access to the software but this is marginal in the scheme of things and I am happy to include checksums (MD5 and SHA) on the site (outside of the OneDrive link) if it helps people.
Anyhow, the short of it is that it is a normal error. Apple adds a quaratine flag because it is not from an offical Apple location or not signed. It takes a moment to solve if the issue occurs.
Solutions can be found on the Apple forum site which your are welcome to follow and I’ll include detailed instrucions.
Apple instructions can be found here:
https://discussions.apple.com/thread/253714860
https://discussions.apple.com/thread/250954782
My simple, overly detailed, step-by-step instructions where I have really broken down every step, can be found below.
On a Mac, head to terminal either through Launchpad or from the Finder through the Applications –> Utilities –> Terminal route.
Launchpad:
Click on the launchpad icon from the Apple dock (typically found at the bottom of the screen) or from a shortcut:
Type in “Terminal” to filter your search results to just the Terminal app.
Click on the Terminal icon to load Terminal.
The full code is as follows:
xattr -c <path/to/application.app>My technique is to copy and past the first portion of code which includes a space at the end:
xattr -c 
and then drag and drop the unzipped TOPD file into the Terminal window.
So for example, if the TOPD file is in the desktop:
to
Press the enter/return button.
That’s it! flag removed and you’re good to go.