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Apple starting to alert users that it will end 32-bit app support on the Mac
"Tomorrow at midnight PT, Apple will begin issuing an alert box when you open a 32-bit app in MacOS 10.13.4. It’s a one-time (per app) alert, designed to help MacOS make the full transition to 64-bit. At some unspecified time in the future, the operating system will end its support for 32-bit technology... meaning those apps that haven't been updated just won't work."
https://finance.yahoo.com/news/apple-starting-alert-users-end-000025623.html
Now would be the time to start taking stock of which programs that you have that are 32-bit and to start looking for updates/replacements. (Quicken 2007 is an obvious 32-bit app that many users still have that will need to be replaced.)
To find which applications you have are 32-bit and which are 64-bit:
Click the Apple menu.
Choose About This Mac...
Click the System Report... button.
Look down the left hand column to Software.
Under Software click Applications.
Wait a bit for the info to be gathered.
The entire right hand window pane will fill with a list of apps.
You can raise or lower the "window shade" to make the pane larger or
smaller by using the dot at bottom center of the pane. Below the
application list is another pane that will show specifics about the app
you click.
At far right in the pane is a column named 64-Bit (Intel). You may
have to expand the window to see this column.
"Tomorrow at midnight PT, Apple will begin issuing an alert box when you open a 32-bit app in MacOS 10.13.4. It’s a one-time (per app) alert, designed to help MacOS make the full transition to 64-bit. At some unspecified time in the future, the operating system will end its support for 32-bit technology... meaning those apps that haven't been updated just won't work."
https://finance.yahoo.com/news/apple-starting-alert-users-end-000025623.html
Now would be the time to start taking stock of which programs that you have that are 32-bit and to start looking for updates/replacements. (Quicken 2007 is an obvious 32-bit app that many users still have that will need to be replaced.)
To find which applications you have are 32-bit and which are 64-bit:
Click the Apple menu.
Choose About This Mac...
Click the System Report... button.
Look down the left hand column to Software.
Under Software click Applications.
Wait a bit for the info to be gathered.
The entire right hand window pane will fill with a list of apps.
You can raise or lower the "window shade" to make the pane larger or
smaller by using the dot at bottom center of the pane. Below the
application list is another pane that will show specifics about the app
you click.
At far right in the pane is a column named 64-Bit (Intel). You may
have to expand the window to see this column.