Please do not double post the same question.
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There can be multiple factors for this error. 8Gb (HD space has nothing to do with this) is really the minimum amount for AC but the main ones:
1. File Size, specifically polygon count
2. Rendering Settings, image size and quality
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You have not specified an OS but regardless these are the troubleshooting steps to try:
1. Close everything do a restart and try again and/or
2. Choose a smaller image size and/or
3. Choose a different rendering preset, and/or
4. Define a smaller rendering area using the marquee, and/or
5. Turn off all unnecessary layers
Eduardo Rolón AIA NCARB
AC27 US/INT -> AC08Macbook Pro M1 Max 64GB ram, OS X 10.XX latest
another Moderator