Problem

After the 3DEXPERIENCE Platform was upgraded to R2026x FD01 on Saturday, February 7th, 2026, some users are encountering a warning that states, "There is a version mismatch between SOLIDWORKS and the language resources for <installed language>. Use the Installation Manager or go to the customer portal to download and install the required language files for 2026 SP1.0".

After encountering this error, SOLIDWORKS Design does not load, and the user is unable to use the software. BR10000419611 in the DS Knowledge Base describes this error and 2 possible solutions to resolve it.

Solution 1: Run Command Prompt

1. Locate Command Prompt in the Start menu
2. Either right-click and choose "Run as administrator" or choose "Run as administrator" in the right column

3. In the Administrative Command Prompt, type the following, including the double quotes surrounding the file path: "C:\Program Files\Dassault Systemes\SOLIDWORKS 3DEXPERIENCE R2026x\win_b64\resources\MSI\SolidWorksR428FD01PP2\hotfix.exe" /reinstall /s /k

4. Wait until the command is finished processing. Note: There will be a warning displayed if the command prompt is closed before the command is done, and there will be a message about a Hotfix being removed and then reinstalled.
5. Once complete, close the Command Prompt.
6. Restart the machine.
7. Launch SOLIDWORKS again and test the behavior.
8. If this doesn't work the first time, repeat steps 1-7

Solution 2: Reinstall SOLIDWORKS Design

These steps only need to be followed if Solution 1 above does not resolve the issue

1. To uninstall, follow the Uninstalling 3DExperience SOLIDWORKS Connected section of: How To Uninstall and Remove 3DExperience SOLIDWORKS Products
2. To reinstall, follow the STEP 03: Installing your Applications section of: 3DExperience First Steps
3. Once complete, attempt launching SOLIDWORKS again.

For additional support, existing customers can submit a ticket or new customers can contact Hawk Ridge Systems.