What is a temporary folder? It is a folder where system intermediate results (temporary files) are stored. As its name implies, they are meant to be there just temporarily, so you should delete them (automatically or manually) on a regular basis, mainly in order to save disk space, because the Cache itself can get really big as it scales with a project. The bigger projects you process the more free space you will need. You need to have admin rights to do so. But beware - in multi-user systems, this can potentially remove active files, disrupting users' activities. That is why there is usually a Temp folder assigned to each user of a computer. It is also advisable to move this folder to another drive, preferably SSD (solid-state drive) with a lot of free space.
We don’t recommend manual removal of the temporary files but, if you want to locate the Temp folder in Windows. Probably the easiest way is to open the Start menu and type "%temp%" (without quotation marks) in the search box and click enter. This will take you directly into the folder. Normally the path is: C:\Users\<username>\AppData\Local\Temp.
The RC's cache-related settings and a Clear cache button can be found in the WORKFLOW tab / Settings. Here you may choose the cache location (system temp / project folder / custom), enable/disable clearing cache on exit, where you can choose from multiple options (items older than … ) or immediately, and also enable/disable cache image metadata. Please note that keeping RC temporary files can be useful for re-using already detected points and reconstructed depth maps.