Some apps offered by {ths} in this shop are built by a single developer without an Apple Developer Program membership, so the app isn't notarized by Apple. Your macOS Gatekeeper will flag it as being from an unidentified developer the first time you open it — that’s expected, and it only happens once.

1. Move the app to Applications, then double-click it as usual. If macOS shows that the app can't be opened because it is from an unidentified developer," or “Apple could not verify…” click Done and continue below — don't move it to the Trash.
2. Open System Settings → Privacy & Security, scroll down to the Security section. You'll see a line naming {ths} Copy Shop with an Open Anyway button — click it, then confirm once more in the dialog that appears.
3. Double-click the app icon and at the following popup click in „Open Anyway“. Enjoy!

1. Move the app to Applications
2. Open the Terminal app (Applications/Utilities)
3. Copy and paste the following line and press return:

xattr -cr /Applications/ths\ CopyShop.app

Now start the app and have fun.