> ## Documentation Index
> Fetch the complete documentation index at: https://docs.loqate.com/llms.txt
> Use this file to discover all available pages before exploring further.
# USA CASS2 Engine
## Our CASS2 Engine
The latest CASS2 Cycle-O engine replaces our old CASS™ engine which was retired as of 31st July 2023.
All existing customers have now migrated to the CASS2 engine.
All customers using CASS2 must download the 2023 Q3.1 Loqate API and CASS2 together using the latest install manager. This is to ensure continuity of the CASS2 service due to a combined bug fix.
## Platform Availability
CASS2 is currently available for the following platforms:
* Windows 32
* Windows 64
* Linux 64
* AIX 64 \*
* SystemZ \*
\*Details on downloading these platform engines are available via your Customer Success Manager
## Release Information
Please run Install Manager to check for the latest version of CASS2 (both library and data).
Data files used by CASS2 expire at the end of the third month of release. For example, CASS2 data released in February expires at the end of Apr. You will see this represented in Loqate with an expiration date e.g September 1st (i.e. good until the end of August). This was a USPS driven change in October of 2022. (reference: [https://about.usps.com/postal-bulletin/2022/pb22603/html/updt\_003.htm](https://about.usps.com/postal-bulletin/2022/pb22603/html/updt_003.htm)).
Please be aware that the CASS™ dataset expiration dates are set by the postal authority. Please ensure that you have the latest library and data installed to avoid loss of service through these products.
## CASS2 Installation
Your license key will determine if the new CASS2 is available to download and install from Install Manager.
If CASS2 is available, the product names will be presented as "CASS2…".
**Important note for Windows users:** Please ensure Loqate is installed outside of the Program Files folder. Even if you enable read/write permissions while inside Program Files, permissions issues may persist.
### Checking if CASS2 is Installed
There are two methods to check if CASS2 is installed, as follows.
**Method 1: Command Line**
Run the following code from the command line:
```bash theme={null}
# Windows
lqtBatch.exe –d
# Linux
./lqtBatch –d
```
If CASS2 is active, your console will display the following (you may need to search for "CASS2" if the console output is very long):
```
—————————————-
Record : 1590
CASS API Expires : 2023-03-14
CASS API Status : Active
CASS Data Expires : 2023-02-28
CASS Data Status : Active
CASS certified software version : 20.15.00.N
DataBase Date : 2022-12-01
DataBase mdVersion : 17236
Name : CASS2Info
—————————————-
```
**Note:** Your 'Record' number will contain a value.
The API status, database date, and expiration dates are displayed.
**Method 2: lqtDemo.exe (Windows only)**
Open `lqtDemo.exe`, click on the tab labelled "GKR", click "Browse" and select your Loqate Data folder. When the file drop-down has populated, scroll through the list and select "CASS2Info". The expiry date will be on the output.
## Updating CASS2
As with the previous CASS engine, when you get to the certified data pack selection screen in Install Manager you will need to select **both the library and USA Verify Datasets for CASS2**.
## Running CASS2 From the Command Line
The same parameters and requests are used in both older and new CASS engines. To use `lqtBatch` with CASS2, pass "cass2" as the parameter for the `-p` option, for example:
```bash theme={null}
lqtBatch … -p cass2
```
[More information about how to use the command line can be found here.](/support/batch-processor/)
### Sample Command Line Script (Windows)
```bash theme={null}
lqtBatch.exe -d -p cass2 -r PS3553 -i -o
## Updating CASS2
As with the previous CASS engine, when you get to the certified data pack selection screen in Install Manager you will need to select **both the library and USA Verify Datasets for CASS2**.
## Running CASS2 From the Command Line
The same parameters and requests are used in both older and new CASS engines. To use `lqtBatch` with CASS2, pass "cass2" as the parameter for the `-p` option, for example:
```bash theme={null}
lqtBatch … -p cass2
```
[More information about how to use the command line can be found here.](/support/batch-processor/)
### Sample Command Line Script (Windows)
```bash theme={null}
lqtBatch.exe -d -p cass2 -r PS3553 -i -o