Minimum System Requirements
OS: Windows 7, MacOS X Lion, Linux
CPU: 1.5 GHz x86, x86_64, or ARM-based CPU with 2 cores
RAM: 1 GB
Available Storage Space: 100 MB
Recommended System Requirements
OS: Windows 10, MacOS X High Sierra, Linux
CPU: 2 GHz x86, x86_64, or ARM-based CPU with 4 cores
RAM: 4 GB
Available Storage Space: 512 MB
is there some other way to sync up LMMS with Reaper?
If you ask, if you can use files created on Reaper in LMMS, then No.
You can export the song as MIDI-notes, and import those in LMMS, but no cross-project options exists.