You can find that number at Steam Apps Page by searching for game and checking the AppID number.
Step 2: Navigate to C drive > Program Files > Steam > SteamApps > downloading folder and delete the numbered folder corresponding to the problematic game. Step 1: Close Steam client by right-clicking its icon at the system tray and choosing Exit option. Reference Solution 1: Make Sure Folder is not Read-Only Solution 8: Take Ownership of the Folder and Give Write Permissions Solution 7: Add Steam to Antivirus Exceptions list Solution 4: Use a Folder Other Than Program Files Solution 3: Perform Folder Fix from Steam Client Solution 1: Make Sure Folder is not Read-Only
Problem: “Library folder not writable” error appear if create a new library for Steam games, especially located on external SSD or HDD drive.
