When changing the new Steam folder, many users encounter the new Steam folder must be writable error. According to a survey, there are some possible causes behind the error including read-only Steam folder, corrupt download cache, write-protected files, hard drive errors, and even your antivirus programs.
Solution 1. Uncheck the Read-only Box in Steam Folder
When the Steam folder not writable folder error occurs, the first and fastest method is to check if you select the read-only box for Steam folder.
Step 1. Open your File Explorer by pressing Win + E keys and then go to the C: /Program Files/steam/steamapps path.
Step 2. Right-click the Steamapps folder and select Properties. After that, untick the checkbox for Read-only and click OK to save the change.
If this error still persists, continue with steps below to delete the downloading folders.
Step 1. Reopen the Steamapps folder and open its Downloading folder.
Step 2. Right click the folder named by number and select Delete. If the folder can’t be deleted, open the Properties window of Steam folder, and then navigate to the Security tab and click Advanced.
Step 3. Click the Change link, and then type your user name in the box and click Check Names.
Step 4. Click OK in the Advanced Security Settings window. Now, you can delete the numbered folder.
Solution 2. Uninstall the Problematic Game
Another simple solution is to uninstall the problematic game and reinstall it from Steam.
Step 1. Open Control Panel window, and then change View by type to Category and click on Uninstall a program.
Step 2. Right click the problematic game, and then select Uninstall and follow the on-screen prompts to finish the process.
Step 3. Relaunch Steam and navigate to the Library tab. Then right click the game and select Install.
Solution 3. Clear the Download Cache
The error “new Steam library folder must be writable” can be caused by corrupt download cache. Follow the steps below to clear the download cache.
Step 1. Launch your Steam client, and then navigate to Steam > Settings.
Step 2. Select Downloads from left pane and then click on Clear Download Cache button.
Solution 4. Repair Library Folder
To help users repair Steam folder error, this client provides “Repair Library Folder” feature. Here you can use it to fix the new Steam library folder must be writable error.
Step 1. Launch your Steam client and click on Steam at the top menu, and select Settings > Downloads.
Step 2. Click on Steam Library Folders button from the right side, and then right click the problematic Steam folder and select Repair Library Folder. Then Steam will automatically detect and fix the Steam folder errors.
Solution 5. Add a New Steam Library Folder
Steam library folders are usually stored in Program Files by default. Once the Program Files become write-protected, you may encounter the error. Here you can add a new Steam library folder to fix it
Step 1. Create a Steam folder outside Program Files and make sure there is sufficient free space.
Step 2. Go to the Downloads > Steam Library Folders again.
Step 3. Click on Add Library Folder, and then select the folder that you just created and click OK. Now, you should be prompted to choose which Steam folder you want to install each time installing a game.
Step 4. Uninstall the problematic game like the steps in Solutions 2 and install the game from Steam and select the new folder to save the game files.
Solution 6. Check Hard Drive Errors
If the Steam Library folder just resides in a corrupted hard drive, you might encounter the Steam folder not writable . In this case, you can use CHKDSK to check and repair hard drive errors.
Step 1. Type cmd in the search box, and then right-click Command Prompt app and select Run as administrator.
Step 2. Type chkdsk C: /f in the command prompt and press Enter. (Replace C with the drive that stores the Steam folder)
Solution 7. Allow the Game Through Your Antivirus Program
Sometimes, your Antivirus program can prevent Steam from accessing certain game files. Here we will take Windows firewall for example to add the game to exceptions list.
Step 1. Type firewall in the search box and select the Windows Defender Firewall.
Step 2. Click on Allow an app or feature through Windows Defender Firewall from the left pane.
Step 3. Then select the checkbox of Steam.exe or the game from the list and click OK.
For AVG, select Home > Settings > Components > Web Shield > Exceptions to add Steam to exceptions list. For Kaspersky, select Home > Settings > Additional > Threats and Exclusions > Exclusions > Specify Trusted Applications > Add.