Install Cyberpanel in arm processor

Can I install Cyberpanel in server using arm64 processor?

No.

Unfortunately I spent many hours trying to discover the same answer, as it is not in the install docs for requirements:

I think from what I was reading around GIT and OLS it is because there is limited support for ARM on OLS, so makes sense, just a pain to find the answer or why.

I tried and got the following just prior to the install terminating:
[08.28.2021_06-21-25] [ERROR] We are not able to run apt-get -y install openlitespeed return code: 100. Fatal error, see /var/log/installLogs.txt for full details.

If I try to load the repo, it cannot locate one:
W: Skipping acquire of configured file ‘main/binary-arm64/Packages’ as repository ‘Index of /debian/ focal InRelease’ does not seem to provide it (sources.list entry misspelt?)

So yeh, looks like a limitation of OLS, although I think many want it.

OLS support ARM based CPU from version 1.4

Some panels like aapanel support OLS and ARM based CPU’s

Also, here is some old example for couple years ago https://groups.google.com/g/openlitespeed-development/c/R97JKgHPhMI?pli=1

aapanel works with ARM CPU but not with openlitespeed. I have checked it myself and can confirm. If you have specific information regarding OLS supporting ARM cpu, then kindly share.