We strongly recommend running 64-bit Geneious Prime if possible.
However if your computer's operating system is 32-bit Windows, you will need to use the 32-bit version of Geneious. Typically only older computers would be expected to be running 32-bit Windows.
If you have a 64-bit operating system, you must install the 64-bit version of Geneious Prime in order to make full use of the RAM available on your computer. 32-bit Geneious can only use a maximum of 1500 MB of RAM regardless of the amount of RAM your computer has. 64-bit Geneious Prime can be downloaded from our main Downloads page.
You can download 32-bit Geneious Prime for Windows from the Previous Versions page on the Geneious website (this includes the current version).
Please be aware that if you choose to run 32-bit Geneious Prime, you may experience issues that are not present in the 64-bit version due to the increasingly restricted support for the 3rd party tools that we use. Most notably, support for the latest release of Java is limited on 32-bit systems, and as a result 32-bit Geneious is bundled with an older version of Java, which is known to have bugs that are addressed in later releases.
32-bit Geneious Prime is only available for Windows. Note that we are considering discontinuing the 32-bit version entirely for future releases of Geneious Prime. If you think this is likely to cause you problems, let the support team know about your concerns.