You may get error 508 while installing Creative Cloud apps on Windows because the package repository is corrupted. This error usually occurs when the folder referenced by the registry key PackageRepositoryRoot at the following directory doesn't exist or is corrupted.
Navigate to the following directory, and check if the folder referenced by the registry key PackageRepositoryRoot is missing or corrupted. If it's corrupted, the name of the folder displays some invalid characters.
The following example shows what the directory with the correct registry entry looks like. Proceed to the given solution if you do not see the folder referenced by PackageRepositoryRoot, or if it's corrupted.