New
#21
There's a whole thread on saving space on C: - try searching the forum for 'save space' e.g.
And see tutorials:
Turn On or Off Storage Sense Automatically Free Up Space in Windows 10
Free Up Drive Space in Windows 10
Routinely temp file space fills, log and dmp and wer files are created...
Ccleaner (utility program) can help; combine that with Wiztree or Treesize and add custom locations as needed.