There seems to currently be no way of getting a list of what the OS considers purgeable files in order to delete them, but there are some candidates to consider, such as cached files. The system will self correct if you can bring the data over in two pieces in your case, or in n-pieces in the general case.
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The main problem is that “purgeable” space is not one monolithic item - it is potentially local time machine or filesystem snapshots, cached data, derived data, iCloud photos at full resolution that will be downsampled as you start to get closer to no free space available.
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How to merge files after using split command from terminal?.
Once you have all the data over, you can combine them - adding the second file to the first, deleting the second file, etc. Then let the system purge files and repeat. In your case, you already have the file you want to copy, so you could split it into 50 GB chunks and copy one chunk over. Then, you just need to delete the files, obviously. This command takes a long time to allocate the memory, you can also stop it when it's 5~10GB and duplicate the file Command D to create copies and speed up the process. Or you can simply let it run until you are out of space in the disk and things start to stop working. It will create a file called hugefile in your home folder, which you can check the size with Get Info and stop when it's big enough for you, using Control C. Do do so, type this command in a terminal: dd if=/dev/zero of=~/hugefile bs=15m
You can create a huge file that will force macOS to clean purgeable files to free you space.
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