MacOS Big Sur elevates Mac to a new level of power and beauty with a refined new design, major app updates, and more transparency around your privacy. Make sure you've tried using the File Default Options command first, since this solves more than 50% of reported problems. If you're having a problem with VueScan hanging or not finding your USB scanner, it's almost always a problem with the USB cable. Mac OS High Sierra launched with a few new features such as an enhanced Apple Photos with new capabilities and many security updates and fixes. There were also quite a few tweaks and fixes that made users want to get the latest Mac OS High Sierra download at the time. APPLE MACINTOSH COMPUTER SUPPORT PAGE for CATALINA (currently 10.15.7) Catalina 10.15.x Released on 7 October 2019. 10.15.7 is working better, with less issues. So, If you have 10.15.4, please update to 10.15.7 as soon as possible. I will keep the information below in the event someone is still having problems.

Catalina [10.15.x]

Released on 7 October 2019

NOTICE

10.15.7 is working better, with less issues. So, If you have 10.15.4, please update to 10.15.7 as soon as possible.

I will keep the information below in the event someone is still having problems.

The below are items that have worked for others. The idea is to try one. If it doesn't work, try the next. Your outcome will vary, and may not work.
10 APR 2020 - Install Microsoft Edge and use it as your web browser as opposed to Safari or Chrome
Between mid October 2019 and mid February 2020 everyone in the Army was migrated to PIV AUTH certificate for Email access. You will now select the CAC certificate WITHOUT the word Email in it. So, you no longer select your Email certificate for Enterprise Email.
Mac users who upgrade to Mac OS Catalina (10.15.x) need to uninstall all 3rd Party CAC enablers per https://militarycac.com/macuninstall.htm
If you purchased your Mac with Catalina, you can skip the Macuninstall page, and go directly to the MacNotes page
How to sign a PDF using Adobe
Please verify these settings on your Mac:
Open an Adobe PDF file,
Select the words Adobe Reader [or Acrobat Reader] (at the top of the screen)
Click Preferences
Under Categories, scroll down to Signatures
In the Creation and Appearance section, click More
Make sure Enable CryptoTokenKit framework support is checked.
Can
You also need to changethe Default Signing Format from PKCS#7-Detached toCAdES-Equivalent
Close Adobe Reader
Double click an Adobe PDF file you need to sign
Problems accessing DTS?
You have to use the Safari web browser (Chrome has not worked for anyone)
Select the Show Details (button)
Click the link titled: visit this website
Click the button that shows: Visit Website
Enter your computer password, [you are manually adding the web address to your keychain access].
Click Update Settings (button)
DTS should now open for you.
I have added some sites I know are having this issue here. You can download the certificates you need. Then will only need to double click it and do a manual trust on them.
Here's How to manually trust the certificate(s): Double click the certificate, select the triangle next to Trust, in the When using this certificate: select Always Trust.
Air Force and Coast Guard users who utilize VMware Horizon need to update their client
Here is the link:

Upgrade To Macos Catalina From Mavericks

https://my.vmware.com/web/vmware/downloads/details?downloadGroup=CART21FQ1_MAC_543&productId=863&rPId=44670
Look here for installation steps
You will see in Table 1 that no CAC enablers are compatible with Mac OS Catalina.
Discounted prices on the programs mentioned below can be viewed here

NOTE:
If your CAC reader is not being recognized by your virtual Windows, follow this guidance:
VMware Fusion: From the menu bar, select Virtual Machine, then USB. Find your CAC reader and select it.
Parallels Desktop- (In Coherent mode): Click the red parallel lines in the menu bar, Select Devices,
USB, find your CAC reader and select it.
Parallels Desktop - (Not in Coherent mode): Simply plug your reader into the computer and select whether you want to use it in Mac or Windows. You may also need to click the word Devices in the top row, USB, then your CAC reader.

VirtualBox: Click the word Devices (at the top of the screen), then USB Devices, and select your CAC reader. When you want to use it on your Mac, go to the same location and remove the checkmark. If you receive an error message when trying to select the reader here follow these instructions:

* In the VirtualBox Graphical User Interface (GUI), click on USB (small icon in the list of devices).
* Then check 'Enable USB Controller' and 'Enable USB EHCI controlling.'
* Lowest on the beach, you'll see a list of icons to your right. Check first. A box appears 'a new filter'. Check it.
* By clicking on the icon below, representative of a USB plug with a +, you'll see a list of drivers.
* Select the one that corresponds to your USB drive. Check it added in the filter window.
CAC Readers: With a variety of CAC readers available today there are also a variety of issues. The SCR series of CAC readers work very well. The SCR-331 reader may need a Firmware Update. See several different models of USB CAC readers here. You will see a small note on some of the readers to show you how to make them compatible with your Mac.

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Air Force users look here for some helpful information

Navy users look here for some specific information

Big Sur (11.0) users, utilize the Big Sur support page

Mojave (10.14.x) users, utilize the Mojave support page

High Sierra (10.13.x) users, utilize the High Sierra support page

Sierra (10.12.x) users, utilize the Sierra support page

El Capitan (10.11.x) users, utilize the El Capitan support page

Yosemite (10.10.x) users, utilize the Yosemite support page

Mavericks (10.9.x) users, utilize the Mavericks support page

Mountain Lion (10.8.x) users, utilize the Mountain Lion support page

Lion (10.7.x) users, utilize the Lion support page

Snow Leopard (10.6.x) users, utilize the Snow Leopard support page

Leopard (10.5.x) users, utilize the Leopard support page

Tiger (10.4.x) users, utilize the Tiger support page

If you are still having problems, contact us

Carbon Copy Cloner requires macOS. CCC will not run on Windows. CCC 5 and 6 both run natively on Intel and Apple Silicon Macs.

CCC 6 is the latest version available. Users running Catalina (10.15) or Big Sur (11.*) should use this version of CCC. If you are having trouble downloading CCC from the link above, try this alternate download location.

Upgrading from CCC 5? CCC 6 is a paid upgrade. CCC 5 Personal and Household licenses purchased prior to February 18, 2021 are eligible for upgrade pricing. When you open CCC 6, it will automatically retrieve your new license or an upgrade coupon that you can use to purchase CCC 6 at 50% off. CCC 5 licenses purchased on or after February 18, 2021 are eligible for a free CCC 6 upgrade license.

Can You Upgrade From Mavericks To Catalina

CCC 6: Support for macOS 11 Big Sur

CCC 6 is qualified for macOS 11 Big Sur. Please take a moment to review the following resources prior to upgrading to macOS Big Sur:

CCC 6: Beta testing on macOS 12.0 Monterey

If you're beta-testing Apple's new macOS 12.0 Monterey, you can help us test CCC 6 against the new OS too. CCC 6.0.2 includes preliminary support for Monterey.

Please choose Ask a Question from CCC's Help menu to let us know if you encounter any problems or have questions about support for new features of that OS.

  • CCC v6 Release Notes.

Carbon Copy Cloner 5 is compatible with Yosemite (10.10), El Capitan(10.11), Sierra (10.12), High Sierra (10.13), Mojave (10.14), Catalina (10.15) and Big Sur (11.*). Note that while this version of CCC may work on OSes newer than Big Sur, we recommend that Big Sur+ users upgrade to CCC 6. We offer technical support for CCC 5, but we are no longer actively developing it. If you are having trouble downloading CCC from the link above, try this alternate download location.

Unsupported Versions

Download CCC 4.1.24 for use on Mountain Lion (10.8), Mavericks (10.9), Yosemite (10.10), El Capitan(10.11), Sierra (10.12) and High Sierra (10.13). If you are having trouble downloading CCC from the link above, try this alternate download location.

How To Upgrade From Mavericks To Catalina

Download CCC 3.5.7 for use on Snow Leopard (10.6) and Lion (10.7). Download CCC 3.4.7 for use on Tiger (10.4) and Leopard (10.5). CCC 3.4.7 and 3.5.7 are provided as-is; we regret that we cannot offer any support for the installation or use of these older versions of CCC.