On the wiki page, requirements for Spectrum 10, only 64 bit Java clients are supported for OneClick clients.
Is it possible to use 32 bit Java client for Oneclick on Spectrum 10?
64 bit clients are required to take advantage of the increased capacity of 64 bit Spectrum 10 but if the additional scale of 64 bit is not needed, and if required, the 32 bit Java client should perform adequately with Spectrum 10, up to a certain limit which will vary in each environment depending on model numbers, landscapes monitored and number alerts generated etc.
As a general rule, the maximum heap size of 32 bit clients on Windows systems will range from 1.4 to 1.6G of memory, while on 32 bit Linux the address space is limited to 2G. If this is exceeded, the client will no longer launch until a 64bit client is utilized. Clients who experience performance problems with the 32 bit client are requested to upgrade to a 64 bit client.
Spectrum 10.0 is tested exclusively with the x64 JRE, but we also fully expect the x32 JRE to be usable as well until reaching the 32 bit heap space limits! 32 bit clients have not been tested by Quality Assurance so are not officially supported with Spectrum 10.