You can download a free 30-day trial of Photoshop or Lightroom (better for batch conversions)... more than plenty for a once-off conversion.
Quote:
Originally Posted by bloodhound31
Unfortunately that takes a 22Mb file and turns it into a 60Mb file at 8 bit, or 120Mb at 16bit. I'm having memory issues with the stacking programs at 22Mb each...
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The stacking software needs to convert your image files (whether RAW or TIFF) into raw bitmap data at some point anyway. The main difference is the amount of disk space you use up.
You can reduce the memory consumption by cropping your photos tightly around the Sun with a 1:1 aspect ratio (e.g. when exporting from Lightroom) so that each image and the final output are smaller.