If you are just trialing ACDSee 10, skip the uninstall of ACDSee 9. Unfortunately anything you were to organize in 10 wouldn't transfer back to ACDSee 9 if you decided to not upgrade. But ACDSee 9 would be fine and still functional.

For the standard user that isn’t sharing databases between multiple computers via EHD

1. Start ACDSee 9 and optimize.
   1. Optimize your ACDSee Database
2. Uninstall ACDSee 9. This step can be actually done at anytime. If you feel more comfortable waiting until you have ACDSee 10 running then I would recommend doing this step at the end.
   1. Go to Start | Control Panel
   2. Choose Add or Remove Programs
   3. Click ACDSee 9 and choose Remove
3. Install ACDSee 10
   1. It will tell you that it needs to convert your database:
   2. 
   3. Click Next
   4. There is no need to Rebuild thumbnails, EXIF and IPTC data for local images so leave that box unchecked.
   5. Do check the Optimize database files after convert
   6. 
   7. Click Next
   8. Click Next to start the conversion.
   9. Once the conversion is done, you should be able to start using ACDSee 10 with all your information/organizing that you had in ACDSee 9.

For the users, that have their database stored on their EHD and upgrading from ACDSee 9 to ACDSee 10, on multiple computers, please follow these specific directions:

1. On the first computer: Follow the steps above, after you install ACDSee 10 and the first conversion screen comes up. To the right of filename click on the … button to browse for you database. Browse to your EHD folder and find the folder where you database is stored.
2. 
3. Continue with the rest of the steps.
4. The Converted database will be stored back in the default location:
   • on XP: C:\Documents and Settings\User Name\Local Settings\Application Data\ACD Systems\Catalogs\100\Default
   • on Vista: Go to this location: My Computer, C:\Users\[Your User Name]\AppData\Local\ACD Systems\Catalogs\100
5. Copy the Default folder back to your EHD and place it a folder called something like: “ACDSee Database 10″
   1. Click on Tools | Options
   2. Click on the Database
   3. At the end of the path of the database, click on the icon and browse to your EHD. On the EHD select this path: ACDSee Database 10\default
6. On your second computer, uninstall ACDSee 9.
7. Install ACDSee 10
8. Cancel the conversion and just point the database to ACDSee Database 10 folder on your EHD.
   1. Click on Tools | Options
   2. Click on the Database
   3. At the end of the path of the database, click on the icon and browse to your EHD. On the EHD select this path: ACDSee Database 10\default

In case of errors:

1. Make sure you have recently optimized in ACDSee Photo Manager 9 . Close ACDSee Photo Manager 9
2. Close ACDSee Photo Manager 10
3. In Version 10 on XP: In Windows Explorer go to this location: "C:\Documents and Settings\YOUR_USER_NAME\Local Settings\Application Data\ACD Systems\Catalogs\100"
4. In Version 10 on Vista: Go to this location: My Computer, C:\Users\[Your User Name]\AppData\Local\ACD Systems\Catalogs\100
5. Right click on "Default" folder and rename it to "oldDefault."
6. Restart ACDSee Photo Manager 10.
7. go to Database | Convert Database...
8. click Next
9. choose ACDSee 9.0
10. For the database location, choose this location if you have never moved her database otherwise choose location where your database is located:
    1. on XP: "C:\Documents and Settings\YOUR_USER_NAME\Local Settings\Application Data\ACD Systems\Catalogs\90"
    2. on Vista: Go to this location: My Computer, C:\Users\[Your User Name]\AppData\Local\ACD Systems\Catalogs\90
11. Click Next & Next
12. Hopefully the errors are gone and you running successfully with ACDSee 10.
13. If not, please post at our forum