If I recall, it's not in the Solus repos anymore because they changed something in their license making it illegal to be used on any non-chinese CPU, maybe that's why the snap isn't maintained anymore
EDIT: here, on this page you can see the following:
If this Software is a WPS Office version for Linux OS, the following apply:
1) You are only entitled to install and use this Software on computers meeting the following operating environment requirements as agreed herein:
OS: Linux OS produced by China brand enterprises, such as Ubuntu or Ubentu Kylin, Deepin, NeoKylin, NFS China, and New Start
CPU: X86 or CPU produced by China enterprises such as Loongson, Phytium, SW, Zhaoxin, and MPRC
Memory: At least 500MB; 1G or more is recommended
Hard disk: At least 300MB available space; 500MB available space is recommended
Browser: Firefox 4.0 or above
2) Kingsoft Office will use commercially reasonable efforts to provide at least fifteen (15) days’ advance notice (via the official website for this Software), prior to amending its policies in connection with this Software, including without limitation, charging for this Software, restricting functions thereof, setting the use period, terminating the license, etc.;
3) You shall not transfer this Software or by any other means attempt to resell, relicense, lease or otherwise transfer the Software for any consideration.
No one actually knows why they have those requirements, someone on the Solus IRC who speaks chinese told us that the same weird requirements are in the chinese version so it's not a translating error. Even if it would be pretty easy to prove that the EULA is not legally binding (if I have less than 500MB of RAM I'm not allowed to use the software?) no one at Solus wants to risk it so it's not in the repos anymore
